This file contains a summary of changes to the Oppia code base. For a full changelog, please see

https://github.com/oppia/oppia/commits/master

v2.5.7 (17 Dec 2017)

--------------------

Learner View:

* Fix #4076: Update end exploration (within collection) headers to better illustrate that the user should return to the collection (#4130)

* Fix #4090: limit number of progress dots for narrow window (#4129)

* Fix #4102: Auto Hide of Navbar (#4108)

* Scroll down to latest Oppia response in learner card when in mobile view (#4110)

* Remove feedback button from mobile learner view. (#4093)

* Added underline to 'Back to collection' link (#4096)

* Prevent hint tooltip from going offscreen on mobile (#4087)

* Various learner view improvements for ItemSelectionInput. (#4083)

* Stop cards from going offscreen in mobile learner view. (#4084)

Exploration Editor:

* Fix #3906: Show Addressed column in State Stats Modal (#4147)

* Check for empty change_list before proceeding. (#4136)

* Fixed part of #3826 - editorFirstTimeEventsService (#4124)

* Log error when ExplorationCommitLogEntry model instance is not found for (#4126)

* Fix exploration graph directive URL. (#4098)

* Fix #4055: Replaced redundant CSS selectors. (#4059)

* Fixed #3146 : Reset Button functionality in preview mode (#4078)

Learner Dashboard:

* Fix #4001: Learner Dashboard Unpublished exploration issue fixed (#4039)

Library:

* Remove globe from exploration summary cards. (#4132)

* Fixed Adjust the tooltip displayed when a user hovers over the globe icon on the library page (#4043)

Infrastructure and Refactoring:

* Move isInteger polyfill to app.js. (#4134)

* Fix part of #3826: Extract stateEditorTutorialFirstTimeService into individual file (#4137)

* Fix part of #3826: Extract services from i18n.js (#4118)

* Fix part of #3826: Extract ExplorationWarningsService into individual file. (#4106)

* Fix part of #3826: extract from EditorServices.js (#3970)

* Fix part of #3826: Extract services from app.js (#4079)

* Fix part of #3825: Rename angular services in Group 5 (#4111)

* Renamed RTC_specs to RTC_definitions and removed useless __init__.py file. (#4101)

* Remove dead code. (#4064)

* Fix part of #2394: Add docstrings to core.domain.subscription_services.py (#4054)

Statistics:

* Fix bugs in GenerateV1StatisticsJob (#4125)

* Fix error in GenerateV1StatisticsJob (#4120)

* Fix ExplorationStateIdMapping job: Yield errors rather than raising Exception in ExplorationStateIdMapping (#4128)

* Fix ExplorationStateIdMapping MapReduce job. (#4113)

* Refactor extensions.answer_summarizers.models logic (#4092)

* Fix 3946: Add visualization for Item selection inputs (#4080)

* Fix #3289: Introduce domain objects for answer calculation output (#4036)

* Fix error in one off stats migration job. (#4068)

* Add state id mapping mapreduce job to the job registry (#4099)

* Implement one off MapRreduce job to generate state id mapping model for explorations. (#4088)

* Implement state id mapping model. (#3963)

* Fixed #3288: Add tests for stats_visualizations_info (#4035)

* Fix errors in the one-off job for stats migration (#4061)

* Fix one last error in the GenerateStatsV1Job (#4215)

* Convert str versions to int (#4210)

* Fix error in GenerateV1StatisticsJob (#4208)

* Fix part of #4195: Modify the references to the continuous stats aggregator (#4201)

* Modified recording of useful feedback count for both v1 and v2 stats (#4198)

* Fix #4179: update calculation for 'addressed' status; make some UI fixes. (#4196)

* Fix #4167: Update answer summarizers job to properly handle answers corresponding to deleted explorations (#4168)

* Handle state migrations in GenerateV1StatisticsJobV1 (#4193)

* Fix #4153: Optional addressed column (#4186)

* Fix #4188: Fixes for the GenerateV1StatisticsJob (#4189)

* Fix part of #4182: make yielded value in map a tuple. (#4183)

* Fix part of #4182: Handle None version events (#4184)

* Fix #4169: Fixes Key error due to plus sign replacements (#4172)

* Catch Exception when failing to retrieve explorations. (#4157)

* Fix #4152: fix bug in solution verification service. (#4154)

* UI fixes to the stats tab (#4150)

Speed:

* Fixed part of #3950: Replace Jinja templates in feedback_tab.html with Angular (#4123)

Interactions:

* Fix remainder of #3794: Add a fraction input interaction (#4100)

* Fix part of #2575: Interactions refactor first milestone (#4115)

* Fix part of #3794: Complete milestone 2 of fraction interaction (#4067)

* Fix #4216 and #4218: link correctly to static assets in interactions. (#4219)

* Fixed error with Clickable image (#4207)

* Fix #4180: bug with the fractions interaction checking integer parts. (#4181)

* Fix #4180: bug with the fractions interaction checking integer parts.

Misc:

* Fix #4140: correctly generalize permissions for creating collections. (#4142)

* Update PULL_REQUEST_TEMPLATE.md (#4117)

* Minor updates to CHANGELOG v2.5.6 after proofreading (#4097)

* Update Authors, Contributors, Changelog, Credits for Release 2.5.6. (#4095)

* Routine update of translations. (#4082)

* Fix part of #3954: Created a Page Object for Thanks Page (#4085)

* Upgrade SSL library version; remove obsolete challenge-response handler. (#4081)

* Simplify karma coverage specification. (#4066)

* Update deploy script (#4156)

v2.5.6 (20 Nov 2017)

--------------------

Learner View:

* Have the tutor card appear directly above the supplemental card on mobile (#3936)

Exploration Editor:

* Fix #3794: Complete milestone one of introducing the new fraction interaction. (#3967)

* Replaced the correct CSS styling for md-checkbox

* Fix #3997: Added proper css for CodeRepl preview (#4053)

* Shorten answer group header summaries so that the existence of multiple rules can be seen. (#4030)

* Fix #3975: Removed repeated warnings for non-alphanumeric strings.

Creator Dashboard:

* Fix #3257: Remember list/grid display preference in the creator dashboard.(#3803)

Site Navigation:

* Text tweak for Teach page. (#4032)

* Fix typo in Donations paragraph (#4040)

Embedding:

* Fix #3976: Show supplemental interactions in embedded explorations (#4052)

Infrastructure and Refactoring:

* Fix part of #3950: Replace Jinja templates in frontend with Angular (#4050)

* Fix part of #3950: Replace Jinja templates in frontend with Angular (#4019)

* Fix part of #3950: Replace Jinja templates in frontend with Angular (#4037)

* Fix #3954: Add AdminPage page object (#3974)

* Fix #3891: Changes made for remaining directives.

Statistics:

* Fix #3987: Reworked Stats tab (#3992)

* Fix #3958: One-off job to use existing stats data to create new ExplorationStatsModels (#3959)

* Only record stats for solutions if not in preview mode. (#4049)

* Fix #3422: Fix answer summarizer job interaction updating (#3955)

* Introduce event model schema version and modify ExplorationStatsModel (#3960)

* Fix #3912: Introduce incremental statistics update and event recording functionality (#3916)

Audio:

* Add fallback for browsers which do not support speech synthesis. (#4028)

* Add fallback to blob-builder on low-end devices (#3937)

* Allow creators to optionally disable automatic text-to-speech for an exploration. (#3918)

* Fix #3993: Standardize check for whether autogenerated translations are shown. (#4002)

Hints:

* Show a tooltip over hint button to suggest that the learner use a hint after a few attempts.

* Fix #4015: Added e2e tests for hints/solutions (#4033)

* Fix #3805: On mobile, the tooltip for the hint button is cutoff on the right edge of the screen.

Speed:

* Fix #3254: Load MathJax only where needed (#4042)

Misc:

* Fix #3791: Paragraph spacing fix (#4048)

* Reformat frontend error message so that StackDriver hopefully catches it. (#4045)

* Fix #4046: SITE_NAME replacement error fixed in license explanation page (#4051)

* Fix part of #2575: Remove load errors from the frontend tests (#4041)

* Fix errors in production due to parameters not working correctly. (#4029)

* Fix issue with lastComputedArrangement occasionally being undefined when calculating the destination state lists.

v2.5.5 (20 Oct 2017)

--------------------

Learner View:

* Have the tutor card appear directly above the supplemental card on mobile (#3936)

* Fix #3993: Standardize the check for whether autogenerated translations are shown. (#4002)

* Fix #3790: Add automatic text-to-speech audio to explorations (#3818)

* Add all supported audio languages (#3903)

* Disable the save button while uploading audio to server; add Spanish support to audio languages; add audio loading message to learner view (#3856)

* Fix #3807: Center the info icon in the footer vertically (#3859)

* Fix #3812: Auto-adjust the size of buttons to fit within small screen widths (#3858)

Learner Dashboard:

* Add timestamps to individual messages (#3873)

* Disable the "feedback updates" send button when there is no text entered. (#3860)

* Fix #3404: Add default placeholder text for mobile devices (#3845)

* Add I18N to “give up” button, and change the tooltip text. (#3844)

Collections:

* Fix issue with the exploration tile in a collection being unclickable on mobile devices. (#3900)

Exploration Editor:

* Replace "source" element with in-line "audio" element in the audio translations editor, to prevent the same audio source persisting incorrectly across multiple states. (#3908)

* Fix #3295: Save a draft of the exploration editor’s change list to local storage, to guard against loss of Internet connectivity while editing. (#3584)

* Fix part of #3400: make the Objective field directives in the exploration settings tab and the publish modal match each other (#3740)

Site Navigation:

* Update the Oppia blog link, and rewrite the Teach with Oppia page. (#3945)

* Add external Foundation links (#3934)

* Fix #3800: Fix hover issue for dropdown menu buttons in the About page (#3855)

* Fix #3828: fix warning erroneously showing up in registration page on Safari (#3833)

Embedding:

* Add v0.0.3 version of embed script, which adds explorationTitle data to messengerServices (#3935)

Infrastructure and Refactoring:

* Fix #3691 Add a config property to add notification emails for failing ML tasks (#3871)

* Fix #2553: Change the "index all explorations" job in the admin dashboard to index all activities (#3831)

* Fix #3687: Batch calls for retrieving the exploration and exploration rights objects. (#3815)

* Enforce the one-service-per-frontend-file rule and frontend naming conventions in more places.

* Fix part of #3891: Refactor directives to use template URLs (#3942)

* Fix part of #2575: Refactor rich-text component directives to use template URLs (#3921)

* Fix part of #2863: Introduce ParamType domain object in the frontend (#3870)

* Introduce Creator Dashboard page object for Protractor tests (#3949)

Misc:

* Fix #3721: Update the release_info script to use LCA and the most recent release tag in order to compile the list of changes, rather than relying on git describe. (#3838)

* Update deploy scripts to match new release process (#3952)

* Update the automatic backup script to automatically split up URLs if needed (#3956)

* Update the backups script to ignore reconstitutable models (#3876)

* Update the release info script to output both new and old authors to Oppia (#3878)

* Add the release script to the codebase (#3839)

* Add script for cutting a new release branch. (#3919)

v2.5.4 (22 Sep 2017)

--------------------

Learner Dashboard:

* Learner dashboard 3.2 (#3759)

* Handle anonymous feedback usernames. Learner Dashboard Hotfix. (#3762)

* Address the bugs in learner dashboard. (#3720)

* Fix #3695: Pull the load tests apart from the main test. (#3729)

* Assign the default dashboard to all the users of the site. (#3760)

* Add user default dashboards job to job registry (#3779)

* Set default dashboard for users and fix a bug in preferences for default dashboard. (#3781)

Site-Wide ACL refactor (new roles/permissions system):

* Fixes #3742: function added for fetching list of exploration rights based on ids. (#3796)

* SiteWide ACl: removing the old system for authorization. (#3696)

Hints:

* Fix #3645: Introduce new Solution Editor and Learner View (#3703)

* Fix #3771: Remove fallbacks (#3772)

* Fixes '0' issue for solutions (#3770)

Machine Learning:

* Fixes for end to end working between Oppia and Oppia-ml. (#3824)

* Enable code classifier for code interaction. (#3767)

* Make answer classification work synchronously. (#3765)

* Code classifier frontend prediction API services. (#3719)

* Fix #3469: Introduce PredictionAlgorithmRegistryService and a sample prediction service. (#3716)

* Fix #3693: Deprecate ClassifierDataModel and update ClassifierTrainingJobModel (#3734)

* Fix #3514: Next job controller (#3658)

Learner View:

* Fix #3612: In embedded explorations, the learner avatars are too large. (#3736)

* Fix #3725: Message bubble triangle (#3749)

* Fix #3258: Add share-to-classroom Button (#3743)

Audio:

* Add audio language preferences (#3766)

* Test uploading audio file with an mpeg container. (#3752)

* Handle audio files with MPEG container with mutagen (#3735)

* Preloading of audio and bandwidth confirmation (#3727)

* Fix issue with inter-paragraph spacing in content field being unintentionally reduced. (#3775)

Editor:

* Remove gadgets functionality and update the exploration schema version accordingly. (#3801)

* Fix part of #3400: Update title field in Publish Modal (#3690)

Collections:

* Fix 'Empty path passed in method' error on the collection page. (#3827)

* Fix #3707 Change the start text of collection learner view (#3816)

Misc:

* Deprecate splash page experiment (#3829)

* Remove extraneous period (#3780)

* Routine update of translations. (#3785)

* Fix #3558: Browser specific alignment (#3768)

* Removed I18N_PLAYER_CONTINUE_NEXT_CARD from the translation files (#3737)

* Eliminates stray tick mark (#3731)

* Fix #3726: prevent graph SVG from overlapping modal footer buttons. (#3728)

* remove data-toggle Fixes #3750 (#3754)

* Fix #3789: Space out the profile drop down icons (#3789). (#3817)

Infrastructure:

* Make the range used for generating IDs much larger. (#3799)

* Derive GCS bucket name automatically. (#3798)

* Simple fix to prevent the last updated field on running the count job. (#3761)

* Fix #2036: Introduces and uses configuration point for assigning a job to a specific queue. (#3745)

* Fix call to base class (#3751)

* Add a one-off job to list which explorations use gadgets; remove old fallbacks job. (#3717)

* Improvements and bug fixes to changes introduced by PR #3671 (#3684)

Code health:

* Fixes #3748 - Changed file names of EmailDashboardService according t… (#3758)

* Code refactor: removed publicize status. (#3739)

Speed:

* Fix part of #3453: Removed jinja template in editor_navigation_directive (#3732)

* Fix #3453: Removed jinja template in collection editor navigation bar directive (#3723)

* Removed jinja template logics in search_results_directive (#3733)

* Remove jinja template in create_activity_modal_directive (#3724)

* Fix #3453: remove Jinja template in create activity button directive (#3722)

Questions:

* Fix #2998 implement collection skills update commands (#3710)

v2.5.3 (15 Aug 2017)

--------------------

Learner dashboard:

* Learner dashboard project milestone 2.1 (#3591)

* Introduce the learner dashboard partially. (#3654)

* Milestone 2.3 of the learner dashboard project. (#3670)

* The fourth milestone of the Learner Dashboard project. (#3659)

* The sixth milestone of the learner dashboard. (#3680)

Site-Wide ACL refactor (new roles/permissions system):

* Site Wide ACL: Milestone 2.1 (#3582)

* Removed super admin role from admin interface. (#3621)

* SiteWide ACL Refactor: Milestone 2.2 (#3641)

* SiteWide ACL: Milestone 2.3 (#3661)

* SiteWide ACL Refactor: implemented test to check that all handlers have decorators. (#3679)

* SiteWide ACL Refactor: Milestone 3.1 (#3682)

* Fix #3698: Shift exception handling for NotLoggedInException so that it does not generate log errors. (#3714)

* Fix #3688: refactoring ExplorationStatusHandler to remove unpublish and publicize functionality as it is not called from frontend. (#3715)

Hints:

* Fix #3595: Hint button should not show for card which do not have hints specified. (#3596)

* Fix #3615: Hint Editor should not allow blank hints. (#3616)

* Fix #3644: Handles empty hint in hint editor by showing a message and deleting it (#3648)

* Move hint button to left corner for supplemental cards (#3702)

Machine learning:

* Storage, Domain classes and helper functions for ClassifierExplorationMapping (#3583)

* Fix #3467: Introduce re-training and add_to_training_queue methods (#3650)

Audio:

* Add audio file upload handler (#3624)

* Create shared audio frontend services (#3647)

* Refactor AudioTranslations so that they are stored as a dict keyed by language code, rather than a list. (#3673)

* Learner view audio translations (#3681)

* Add editor for audio translations (#3692)

* Audio fixes: make audio download URL safe; don't show flagging modal if all translations are flagged; use templateUrl for modals. (#3709)

* Learner audio updates (#3705)

Learner view:

* Fix #3585: Corrected arrows in exploration progress nav (#3605)

* Change 'style' to 'ng-attr-style' in an attempt to fix IE bug in collection viewer. (#3636)

* Fix #3618: stop user icons in learner view from overlapping (#3642)

* Standardize button colors and styles in the learner view (#3662)

* Make the representation of the learner's 'Continue' answer more conversational. (#3675)

Editor:

* Adding warning about license terms of images (#3603)

* Fix #3505: Implement crop on filepath editor (#3597)

* Fix #3446: Text Input Validation (#3580)

* Close customize interaction modal window if user clicks outside (#3623)

* Minor changes to editor text (#3627)

* Improve image uploader warning message. (#3674)

* Refactor state content editor into a directive. Establish pattern for testing directives. (#3683)

Collections:

* Introduce Skills in collections (#3376)

* Deprecate SkillListObjectFactory. Remove unneeded skill methods from the frontend. Use skill IDs throughout where possible. (#3676)

Misc:

* Fix translations on creator dashboard page (#3625)

* Fix #3249: Bio in the profile page has to be limited to certain length (#3639)

* Fix #3665: select2 placeholder width (#3667)

* Fix #3551: Manually set cookie value during language change (#3622)

* Fix #3686: fixed text overflow for contributors list (#3697)

Fix #3701: Fixed inconsistent Continue button name in exploration learner view (#3711)

Infrastructure:

* Add config property to admin page for SSL config. (#3600)

* Fix user bios job in the case that user_bio is None (#3632)

* Fix #2639: Updated Google chart/visualization Library loader code and use async to load the library (#3614)

* Add backend functionality to correctly handle needs_update part of subtitled HTML. (#3620)

* Part of #2447: Upgrade select2 library (#3626)

* Remove erroneous clause in app.yaml. (#3643)

* Fix #3515: Implement StoreJobResult controller, a preliminary handler for storing job results. (#3559)

* Introduce output list formatting method to core.jobs.BaseJobManager (#3671)

* Fix #2394: Clean up core.jobs documentation (#3519)

* Fix #2447: Caching should be done on a per-file basis (#3454)

Code health:

* Fix #2394: Add docstring to core.domain.user_jobs_continous.py (#3569)

* Fix part of #2394: Added docstrings in exp_domain.py (#3578)

* Pull exceptions classes out of base handler class in base.py. (#3651)

* Fix #2394: update docstring for core.domain.stats_services (#3586)

Dev tools:

* Fix #2508: Automatically generate dummy explorations (#3568)

* Fix #3655: Dummy explorations are published but not indexed in library page (#3656)

v2.5.2 (9 Jul 2017)

-------------------

Fallbacks/hints:

* Fix #3537: Handles empty feedbacks for fallback outcomes (#3538)

* Fix #3532: Implement back-end for Hints and Solution feature (#3533)

* Fix #3554: Migration of Fallbacks to Hints (#3555)

* Fix #3571: Introduce first version of Hints UI for learners (#3577)

Learner Dashboard:

* Fixed a part of the second milestone of the learner dashboard project. (#3482)

* Fetch all entities for the learner dashboard in a single RPC call. (#3536)

Permissions:

* Milestone 1 of sitewide ACL refactor (PRs #3493, #3517, #3543)

* Default role added to role field in user settings model. (#3587)

Machine Learning:

* Fix #3465: Updated and renamed to ClassifierDataModel (#3504)

* Fix #3466: Add storage, domain classes and tests for TrainClassifierJobModel. (#3511)

* Fix #3528: Add helper functions for ClassifierTrainingJobModel (#3529)

Explorations and Interactions:

* Fix a bug in the LogicProof interaction where operators were not being included in the student language, causing operators like 'A(x)' to be rejected even if they occur in the question. (#3545)

* Remove warning sign in interaction save button; make some warnings more user-friendly. (#3525)

* Fix #3446: Numeric input validator (#3470)

* Fix #3295 Add backend support for draft change list id (#3560)

* Fix #3295 Integrate draft change list id with front-end (#3565)

Answers:

* Add a function for getting some sample answers for a given state. (#3530)

* Implement data extraction query controller and form. (#3581)

Collections:

* Fix #3438: Alternative to indicate next lesson in collection (#3523)

* Fix a couple of UI issues in the collection editor. (#3524)

* Add "back to collection" link to reduce potential confusion for users (#3544)

UI tweaks:

* Add two new splash page variants; update which splash pages users see (#3589)

* Fix part of #3505: Improve image upload interface (#3552)

* Allow user to resize images before uploading them in filepath editor (#3574)

* Fix responsiveness of feedback button in navbar. (#3527)

* Fix part of last tile showing in library (#3539)

* Fix bugs related to feedback button visibility. (#3540)

Utilities and infrastructure:

* Fix #3249: Create MR Job to calculate length of User bio (#3510)

* Allow list type schema value to be empty (#3542)

* Fix #3502: Extract components from HTML string (#3549)

* Fix #3521 Moved constants to improve rendering performance (#3570)

* Add a test to prevent HTML errors in translations, and fix existing errors. (#3579)

* Refactor content property to include audio translations. (#3590)

* Fix issue with files being converted to wrong type; re-harden backend validation. (#3593)

Dev tools:

* Fix #3557: make http://localhost:8181 open in default browser (#3566)

* Remove .jscsrc (#3561)

Code health:

* Fix #2394: docstring for rights_manager domain (#3500)

* Remove hybrid get_or_create_user() function. (#3513)

* Fix #2254: Move embedded scripts into controllers, use ng-click (#3534)

* Fix #2394: added docstrings to core.domain.value_generators_domain (#3564)

* Move embedding tests to a separate file to avoid contention. (#3594)

v2.5.1 (11 Jun 2017)

--------------------

Editor:

* Fix #2994: fix bug with alert message showing up in collection editor when invalid exploration IDs are entered. (#3383)

* Fix #3342: Add a "Cancel" button to the "Add Interaction / End Exploration" window. (#3384)

* Prevent regions to be dragged outside the parent image's area (#3388)

* Fix #3344: Have the UI automatically identify draw mode vs drag mode vs resize mode, etc. (#3389)

* Fix #3417: Make region names editable in-place (#3449)

* Fix #3495: Implement a one-off job to list all current fallbacks (#3496)

* Minor changes to improve the display of visualizations in the stats tab. (#3489)

* Fix #3406: Allow adding an image to the Continue button (#3425)

Accessibility:

* Fix #2978: Add a skip navigation link (#3183)

* Update donate video URL to force English captions (#3463)

Learner Dashboard:

* First milestone of the Learner Dashboard Project. (#3423)

Learner view:

* Fix #3402: Detect learner fatigue (#3474)

* Fix #3430: Fix Oppia avatar placement in help cards in learner view (#3475)

* Fix part of #2869: Add mobile feedback button to exploration player. (#3398)

* Fix #3456: Full exploration title on mobile visible as info icon (#3476)

* Fix #3269: Use responsive min-width in exploration player, add viewport styles to CSS (#3494)

Machine Learning:

* Fix #3363: Implement training conditions for classification (#3450)

* Added mapping for classifier_data_schema_version (#3501)

Infrastructure:

* Upgrade GAE version to 1.9.50. (#3386)

* Upgrade pylint-1.7.1 and ensure __init__.py file is present. (#3385)

* Fix PipelineSetupError when MR jobs are run on the dev server. (#3393)

* Fix #3455: Fix bugs with installation process on Vagrant. (#3460)

* Rebalance protractor tests so that the misc suite has less chance of timing out. (#3479)

* Add config property for VMID and shared secret key mapping. (#3484)

* Remove 'set -e' from .travis.yml (#3488)

Collections:

* Fix #3365: Landing page for fractions has been implemented. (#3378)

* Fix bugs causing the collection editor not to load. (#3410)

* Fix #3062: Open-in-new-tab for small screen widths in collection learner view (#3416)

* Fix part of #2569: Add e2e tests for collection editor (#3428)

* Fix #3411 fix button classes on collection editor (#3414)

* Fix #3324: adjustments to collection learner view (#3443)

* Fix part of #2030: Add exploration search in collection editor. (#3477)

I18N:

* Fix #3372: Hindi Language Translation for 'Sign In with Google' (#3380)

* Fix part of #3132: Added i18n support for Contact, Get Started and Teach pages (#3374)

* Update I18_PREFERENCES_EMAIL_EXPLAIN explanation text for clarity (#3436)

* Updates to translations

Code health and refactoring:

* Fix #3198: Remove FormBuilder.js from base.html

* Fix remainder of #2700: Update directives to directly reference templates (#3371)

* Fix part of #2863: States object factory update (#3358)

* Fix #2536: Adds tests for gadget cmds and ensures tests actually do something (#2721)

* Add missing dependency to autosaveInfoModalService. (#3420)

* Fix #2925: Refactor exploration data handlers into ReadOnlyExplorationBackendApiService and EditableExplorationBackendApiService (#2999)

* Expose getCustomizationArgsWarnings in all validators (#3445)

* Delete obsolete reader_view_load_test.py file. (#3451)

* Fix #3286: Remove all temporary code and models introduced as part of the answer migration (#3452)

* Fix part of #2394: Add docstrings to collection_domain.py (#3447)

* Fix part of #2394: Add docstrings to core/storage/file/gae_models.py (#3457)

* Fix part of #2394: Doc Strings for controllers/base.py (#3448)

* Renamed validator.js files to {Interaction}ValidationService.js (#3483)

* Move suggestions.js back to misc test suite to see whether that alleviates Protractor test failures. (#3486)

* Rename dashboard to creator dashboard to make way for the learner dashboard. (#3497)

* Part fix for #2394: Add docstrings to core.domain.feedback_domain (#3499)

* Fix #2394: add docstrings to core/domain/stats_jobs_one_off.py (#3461)

* Fix #3485: Added e2e test for exploration search in collection editor. (#3507)

* Fix #2394: Update docstrings in feedback_jobs_continuous (#3498)

UI tweaks:

* Fix #3328: Change the triangle icon in learner view when a user clicks on it (#3379)

* Better account for overflowing text on summary cards (#3381)

* Fix #1782: tooltip placement issues (#3409)

* Ensure that footer doesn't cover content with lower resolution on error message (#3458)

* Fix #3427: Make social icons in creator dashboard aligned flush left with row above. (#3441)

Other:

* Fix #3296: MR job to get the distribution of username lengths. (#3375)

* Fix #3259: the number of feedback items in the dashboard is incorrect. (#3391)

* Fix responsiveness of donate page (#3492)

* Fix #3471: Remove Recently published section from library page (#3481)

v2.5.0 (14 May 2017)

--------------------

Infrastructure:

* Fix #1442: Provide a new framework for visualizing answer statistics (PR #3294)

* Fix #3292: Migrate all answers to a new storage system (PR #1205)

* Fix part of #2700: Update directives to directly reference templates (PR #3346)

* Fix #3283: fix the interactionRulesService error in trainUnresolvedAnswerModal. (PR #3325)

Learner view:

* Fix #3332: Rescale Lesson Avatar Image (PR #3337)

* Fix #2482: Make learner's answers contained within card in mobile view. (PR #3248)

* Fix #3362: Improve responsiveness of navbar (PR #3364)

Interactions:

* Fix #3343: Add trash icon for deleting regions (PR #3373)

Other UI:

* Fix #3329: 'Error 404: Page not found' has broken footer (PR #3354)

* Fix #3355: Change of Font Awesome Icons for relevancy (PR #3367)

* Fixed #3327 Changed text from 'highlight' to 'hover over' (PR #3335)

Misc:

* Allow admins to edit private activities (PR #3359)

* Fixes open in new tab bug for Firefox (PR #3348)

I18N:

* Fix part of #3132: add i18n keys to About and Profile pages; minor Hindi translations for the search bar (PR #3299)

Code health:

* Fix #3064: Pull directive-specific CSS into the corresponding directives (PR #3352)

v2.4.2 (22 Apr 2017)

--------------------

Collection player:

* Fix #3327: Changed text in collection player card from 'highlight' to 'hover over' (#3335)

* Fix open in new tab bug for Firefox (#3348)

* Only show 'return to collection' when there are no other recommendations to show, so that the learner is not confused about what to do next. (#3312)

* Fix #2985: Introduce collection learner view mobile version (#3197)

* Convert GLOBALS to AJAX for collection editor permissions (#3126)

* Fix #3131: collection footer and sharing directive added to collection player (#3216)

Editor:

* Fix #3028: Add confirmation modal dialog for clearing image and regions (#3339)

* Fix #1774: Changed color combination required for visibility of reminder bubble in editor. (#3277)

* Fix #3093: Popover of Userhelp button remains constant when the user creates the exploration for the first time. (#3267)

* Add dependencies to collection editor (#3261)

* Fix #3094: Fix license terms link in image interaction (#3236)

* Fix #2813: Customization arg model is bypassed for interactions that have no arg to customize. (#3176)

* Fix #3101: Discard-draft Tooltip (#3205)

* Fix #3099: Clarify error message for Item Selection and Multiple Choice interaction (#3184)

* Fixes #3051: Image regions can be resized by clicking and dragging (#3144)

* Fix #3122: Number Fields Bring Up Numeric Mobile Keyboards (#3167)

* Fix #2039: Allow editors to preview summary tiles (#3069)

I18N:

* Fix part of #3132: Add i18n keys to About and Profile pages; minor Hindi translations for the search bar (#3299)

* Fix part of #3132: Add missing i18n keys and Hindi translations for creator dashboard (#3235)

* Fix part of #3132: Add missing translation keys to preferences page (#3231)

* Fix #2734: Add i18n keys to preferences (#3219)

Creator Dashboard:

* Fix #2160: Introduce first version of tests involving deleting explorations for creator dashboard (#3196)

* Fix #3318: Style fixes for collection card in creator dashboard (#3330)

* Fix overflowing of names in the subscription card. (#3270)

Machine Learning system:

* Fix #3283: Fix the interactionRulesService error in trainUnresolvedAnswerModal. (#3325)

* Fix #3282: Fixes the validate() function for LDAStringClassifier (#3322)

* Fix #3297: Renaming Classifier Registry method (#3298)

* Fix #3045: Introduce end to end test for classifyHandler (#3255)

* Fix #2986: Add helper functions to classifier_services.py (#3070)

* Updated tests with assertRaisesRegexp and test to test type of elements in LDAStringClassifier

* Added tests to LDAStringClassifier and added comments in classifier_domain_tests

* Fix #3180: Fix the "interactionRulesService" not found error in teachOppiaModal. (#3181)

* Fix #3169: Fix the alignment of the submit button in teachOppiaModal (#3171)

Splash, About, Donation pages:

* Fix #3319: Oppia video at the donation page no longer shows "Related videos" after the video finishes (#3321)

* Update donation page statistics. (#3313)

* Introduce a promo bar (#3262)

* Fix #3097: Make splash page buttons non-constant width to accommodate different languages. (#3191)

* Fix #2400: Oppia-donation card margin corrections (#3214)

* Add a check that user contributions for logged in users exist on the home page redirect check (#3213)

Code health:

* Fix #3064: Refactor CSS into corresponding directives (#3352)

* Refactoring: removed 'role' variable from GET request used in editor.py in delete method (#3275)

* Fix part of #2863: Create ParamChange object factory (#3302)

* Fix part of #2394: Added docstrings in summary_services.py (#3263)

* Fix part of #2863: Create trigger object (#3273)

* Fix part of #2863: Create outcome object factory (#3260)

* Fix part of #2863: Create front-end domain object for Rules (#3229)

* Fix part of #2394: add docstrings for core/platform/models.py (#3226)

* Fix part of #2863: Create front-end content object factory (#3224)

* Fix #2394: Add useful docstrings to core/storage/job/gae_models.py (#3195)

* Fix #3192: shifted back css of oppia-sidebar-menu-open back to oppia.css (#3211)

* Fix part of #2863: Create front-end fallback domain object (#3207)

* Fix part of #2863: Create front-end domain object for Interactions (#3049)

* Fix part of #2394: Added docstrings in cron.py (#3182)

* Fixes part of #3064: pull the directive specific css in corresponding files from oppia.css (#3077)

Infrastructure:

* Fix #3199: Refactor constants loading to avoid synchronous XMLHttpRequest (#3323)

* Fix #1852: Transition to ESLint (#3264)

* Add installation of peer dependency: jasmine-core. (#3266)

* Upgrade protractor, karma and karma-jasmine (#3251)

* Fix #3047: Collection contents migration (#3209)

* Fix #3232: Generate source maps into separate files (#3233)

* Add e2e test to visit the links in the about dropdown (#3223)

* Add e2e tests for suggestion acceptance on explorations (#3202)

* Fix #3162: set expiration explicitly for files in the build directory. (#3203)

* Remove remaining extraneous js files from base.html #3137

* Fix #2828: Add IE9 support for sidebar. (#3178)

Other UI fixes:

* Fix #2018: make toast z-index lower than navbar z-index (#3320)

* Fix #2870: Limit exploration cards to screen width to maintain centering. (#3250)

Misc:

* Fix #2936: Limit the length of goal description in explorations. (#3274)

* Fix #3293: Introduction of a static maintenance page (#3308)

* Fix #3135: Switch from Static Image Resources By Using Existing Font Awesome Icons (#3193)

* Fixes: footer padding on mobile, #3121 (#3186)

* Localisation updates from https://translatewiki.net.

v2.4.1 (12 Mar 2017)

--------------------

Interactions:

* Fix #3027: Update Add Vertex functionality in GraphInput, when vertex is added mode is changed to "MOVE". (#3115)

* Fix #3102: Update Guppy to 260da66 to enable better compatibility with non-US keyboards (#3103)

* Fix #2964: remove reset icon and add undo reset functionality in pencil code editor (#3055)

Accessibility:

* Add span text with special class for several icon buttons and links; fix focus styles issue for seach bar; no focus style fix required for language select element

* Update icon button text width to address spacing issue in Chrome; Add ARIA role to About, Profile, and exploration Author profile to offer screenreaders some indication that these are menus; Update delete icon on select input to have icon button text; Remove aria-label from item selection to allow for clearer labels

* Add aria-label to user menu so that it is properly read as user menu instead of as user avatar; add role to author profile dropup menu so that it is recognized as a menu; update icon accessibility span class name to be more descriptive and add more to the comment above the style in oppia.css

* Fix #2955: add alt tag equal to value of getCategory() (#3023)

UI tweaks:

* Fix #2814: Add new items button visibility in the SetInput interaction on mobile (#2951)

* Fix #3120: Buttons on About page have text overflow on mobile. (#3123)

* Fix #3037: changed the height of the dropdown save button and width of the discard draft button. (#3100)

* Fix #3063: change the default confirmation box in "discard draft" to modal (#3068)

* Remove word-break so that lesson titles don't break unnecessarily across lines. Reverts part of #2971. (#3130)

* Fix #3129: Make navbar text items visible again by changing to rem. (#3150)

* Fix #3066: fixed summary tiles to show the full objective. (#3128)

* Fixes #3136 alignment of oppia meaning text in about page after doing required changes (#3153)

Code health:

* Convert state dictionary data in FeedbackTab to State objects (#3125)

* Add docstrings for core.domain.param_domain.py (#3078)

* remove image uploader directive from base.html (#3090)

* Remove more js files from base.html (#3087)

* Fixes #1695: Way to automatically provide backend constants to the frontend. (#3033)

* Fix #1858 Added source-maps for better debugging (#3086)

Other:

* Fix #3094: Change the license terms URL link to go to foundation tab of about page. (#3105)

* Fix part of #3073: Add exploration link to feedback email. (#3108)

* Change http to https in some places in setup.sh, particularly for downloading node. (#3133)

* Add analytics tracking for card-transition and completion in the player. (#3088)

* Fix #2987: add a "correct" field to each answer group (#3084)

* Fix #2966: modified the the redirection rules when the user goes to root url (#3034)

v2.4.0 (18 Feb 2017)

--------------------

Collection Player

* Fix #3031: track user progress and minor UI changes to match original mocks (#3054)

* Fix bugs and improve UI

Subscribers

* Fix part of #2287: Display subscribers and subscriptions and send emails on publishing. (#3036)

Creator Dashboard

* Standardize truncation of objectives and display of titles on summary tiles. (#3067)

Accessibility

* Standardize focus styles across site

Other

* Fix #2990: Implement workaround to make MathExpressionInput usable on mobile devices. (#3039)

* Fix #2989: Check if all files end with exactly one newline character. (#3005)

* Added docstring to "core.domain.exp_services" (#2924)

* Add Classifier model id (#2961)

v2.3.9 (14 Feb 2017)

--------------------

Collection Learner View

* Fix #2526: Path version of the collection learner view (PR #2979)

UI Tweaks

* Fix #2874: Show the exploration name in the mobile view (PR #2888)

* Fix #2894: Align the footer properly for exploration player in mobile view (PR #2897)

* Fix #2893: Modify buttons on Teach page to make width uniform (PR #2898)

* Fix #2817: Move Call to action buttion in Teach Page and fixes on about page bar on small screens

* Fix #2816: Add call to action buttons to the Foundation page (PR #2903)

* Fix #2817, Move Call to action buttion in Teach Page and fixes on about page bar on small screens (PR #2911)

* Fix alphabetical ordering of authors (PR #2912)

* Fix #2821: Fixed vertical alignment of headers (PR #2909)

* Fix #2914: Improve spacing of buttons on Teach and About pages

* Fix #2868: Fix social icons positioning in hamburger menu (PR #2932 and PR #2949)

* Fix #2551: Add full objective in the library tiles as tooltip (PR #2934)

* Remove links from collection page objectives in table and capitalize first letter of first word in objective

* Fix #2944: Changed z-index on splash button container so browse button is clickable. (PR #2970)

* Fix button text size on splash page (PR #2928)

* Merge branch 'develop' into translatewiki

* Fix #2620 : Fix exploration card height and deadzone (PR #2971)

* Fix #2918: Fix collection tile in creator dashboard. (PR #2973)

* Fix #2975 Adds full objective in the library tiles as popovers

Site Reliability/Assessibility

* Add -L for curl redirect (PR #3021)

* Fix #3010: Replace nodelist.forEach use with for loop for better compatability. (PR #3019)

* Fix #3003: Use Angular's debouncer for Library search. (PR #3006)

* Fix #2830: update styles in footer sharing links to allow them to show in IE (PR #2917)

* Add h1 on collection page and add ARIA role to footer tag (PR #2959)

* Refactor capitalizing the exploration objectives on the collection page to remove javascript from the html.

* Fix #2922: Hide hamburger menu >768px, add function to handle navbar overflow (PR #2927)

* Fixes #2956: Images in explorations have descriptive alt attributes (PR #2972)

* Fix part of #2862: Add alt attributes to images (PR #2957)

* Fix #2954: add appropriate lang attribute to site pages (PR #3004)

* Fix #2919: Fix the loading of the editor page. (PR #2958)

Emails

* Fix part of #2557: Refactoring of email preferences and add functionality to incorporate user's preferences of feedback / suggestions (PR #2892)

* FIx #2768: Implement email receiving functionality for feedback messages. (PR #3029)

* Rename userExplorationEmailsHandler service to UserEmailPreferencesService (PR #3040)

Frontend Refactor

* Fix #2722: Split exploration save and publish button to directive (PR #2896)

* Fix part of #2863: Create AnswerGroup domain object (PR #2883)

* Add dependencies to collection editor html (PR #2996)

Subscriptions

* Fix part of #2287: Email preferences for subscriptions

* Fix part of #2287: Add handlers for subscription and unsubscription (PR #2886)

* Fix part of #2287: Add subscribe and unsubscribe button to profile of authors

Machine Learning

* Fix #2726: Create domain & storage classes for classifier model & tests (PR #2846)

* Fix #2728: Add AlgorithmRegistry and test class. (PR #2926)

* Fix #2950: Moved classifier methods and test from reader to classifier_services (PR #2974)

Dev tools/code health

* Add travis retry all tests except for backend and linting (PR #2890)

* Add Docstrings in exploration/gae_models.py (PR #2889)

* Fix #2455: Add lockfile functionality to fix inconsistent directory permissions in Vagrant (PR #2749)

* Update release info output to fit format of changelog (PR #2908)

* Fix #2857: Added excluded_dirs in Lint pattern matching (PR #2905)

* Fix #2064: Add a test for keys present in source code and not in en.json (PR #2933)

* Fix #2394: Add docstring to core/storage/user/gae_models.py (PR #2962)

* Docstrings added in the file core/storage/email/gae_models.py (PR #2900)

* Fix part of #2394: Update docstrings in core.storage.collection.gae_models (PR #2982)

Other

* Update translations from translatewiki

* Fix translatewiki attirbution in credits (PR #2916)

* Fix #2662: Upgrade math-expressions to 370a77. (PR #2984)

* Update guppy to the version f6e0bbf in order to prevent a startsWith() error in IE. (PR #3041)

v2.3.8 (10 Jan 2017)

--------------------

Learner view:

* Fix tutor card icon not clickable in learner view (PR #2824)

* Fix #2832: Add space between footer and summary explorations container (PR #2833)

* Fix #2842: do not submit an answer or clear the help card if there is already a destination card defined. (PR #2843)

* Fix #2800: Style the author profile pop-up like about dropdown (PR #2864)

* Fix #2680: Ensure that the the help card can be seen (PR #2835)

* Fix #2588: Make LATEX smaller in learner view (PR #2854)

Splash and donations pages:

* Add call to action links on English default splash page (PR #2818)

* Fix #2855: Fix showing help text when javascript is not enabled (PR #2856)

* Fix #2128: Add alt tags to about page (PR #2858)

* Fix #2877: splash page banner should not be able to scroll horizontally. (PR #2879)

* Add 'Get Started' link to the sidebar. (PR #2836)

* Fix #2815:add third button for credit card payment (PR #2881)

* Fix #2128: Add alt tags to donate, library, and splash pages (PR #2882)

Dashboard:

* Fix #2764: Enable right clickability for all explorations in the dashboard (PR #2823)

* Remove the 'total number of feedback threads' statistic from the dashboard. (PR #2837)

* Fix #2548: Make sorting in the dashboard more intuitive. (PR #2838)

Other pages:

* Fix #2716: Show only simple editor tools on medium screens (PR #2850)

* Fix #2789: Remove white panel behind exploration cards in profile page. Remove 'Portfolio' text. (PR #2810)

* Fix #2026: Add panel to show collection owner and permissions (PR #2865)

* Fix #2801: Change collection style in library and remove shadows from carousel scrolling. (PR #2876)

I18N:

* Update various translations

Emails:

* Initial work on email muting (PR #2851)

* Initial work on email subscription preferences (PR #2849, #2878, #2886)

Code health:

* Fix #2248: Add e2e tests for feedback on explorations (PR #2753)

* Fix #2251: Add e2e tests for parameters (PR #2834)

* Add tests to make sure that test email is not sent to query recipients. (#2848)

* Update docstrings in user_services.py (PR #2622)

* Remove unused images in assets/common (PR #2847)

* Fix #2727: Refactor classifier so a BaseClassificationAlgorithm class can be used as a base for classification algorithms (PR #2743)

* Fix #2722: Split exploration editor into several files (PR #2844)

v2.3.7 (4 Dec 2016)

-------------------

Learner view:

* Fix #2686: make autofocus behave correctly in the player view (PR #2805)

* Do not wrap mathematical formulae that are less than 500px wide (PR #2772)

* Fix some janky animations in the learner view (PR #2809)

* Fix #1924: rename the button at the end of an exploration from 'return to library' to 'go to library' (PR #2771)

Editor:

* Fix #2626: in the exploration editor, gray out the screen immediately after a draft is discarded (PR #2663)

* Move exploration save/publish functionality to a new explorationSaveService (PR #2718)

* Reword the 'share' invitation after a creator publishes an exploration.

Library page:

* Remove thumbnail images that show up in exploration summary tiles on the search page (PR #2756)

* Increase the debounce time for executing a search query.

Other pages:

* Update the copy across the site (PR #2793)

* Fix #2735: standardize the backgrounds for the collection player, exploration player and various static pages (PRs #2758, #2763, #2782)

* Fix #2788: Make all the background colors consistent throughout the site (PR #2794)

* Remove functionality for opening the sidebar on swipe (PR #2769)

* Fix a bug where the navbar overflowed off the right side of the screen (PR #2795)

* Fix an incorrect navbar breakpoint (PR #2795)

* Fix #2787: eliminate blue outlines on focused buttons (PR #2797)

* Fix the color of collection descriptions in the creator dashboard (PR #2765)

* Fix part of #2665: split up directives in FormBuilder.js into separate files (PR #2666)

Interactions:

* Add a benchmark test for the string classifier (PR #2697)

* Fix #2754: make the math expression input field clearer (PR #2785)

* Fix #2755: allow the math expression input field to accept fractions.

* Add a 'submit' button to the NumericInput interaction.

I18N:

* Add Turkish translations.

Emails:

* Fix #2269: complete the functionality for sending emails to all users returned via a query (PR #2717)

* Fix #2790: add functionality for testing a bulk email prior to sending it out (PR #2799)

Dev tools:

* Update node.js to v6.9.1.

* Update guppy to v1.1.0 (PR #2786)

* Fix #2611: update protractor to v4.0.11 (PR #2777)

* Add e2e tests for collections

* Remove the flaky performance test from the regular Travis build (PR #2757)

* Fix an issue where Travis was broken because it could not detect the location of the Java executable (PR #2796)

* Fix #2773: remove some flakiness in the interactions e2e test.

* Fix a YouTube console error in the e2e tests (PR #2742)

Code health:

* Add docstrings to email_manager.py (PR #2720)

* Add docstrings to html_cleaner.py (PR #2779)

v2.3.6 (14 Nov 2016)

--------------------

Learner view:

* Update learner view design by adjusting spacing at top of cards, augmenting card shadows, updating background images, and removing the share icons at the end.

* Hide continue button when pagging back through the cards

* Add Math component while suggesting changes

* Fixed footer in learner view

* Update the backgrounds of both players to use a solid blue background

* Change font color from white to green at end of exploration

* Fix color of progress dots in learner view

* Fix tutor card position when viewport is narrow

* Fix jittering help card at a certain size

* Fix formatting error in item selection interaction display of learner answers

* Add automatic line breaking for LaTeX expressions

Editor:

* Update the warning labels for changing the objective to be more clear

* Upgrade math-expressions library and interpret the creator-defined string as LaTeX instead of text

* Fix a bug where customization arg attributes are saved in the wrong order, leading to the item selection input interaction not recognizing HTML snippets with images

* Add focusing functionality to the rich-text editor

Collections:

* Add option to go to collection view after finishing an exploration

* Use collection-summary-tile for collections on small screens

* Ensure explorations of a single state are properly recorded when completed

* Remove 'Collection >' breadcrumb from collection player navbar

Library page:

* Make library carousel title links more obvious and remove "View All" button

* Add protractor tests for visiting library pages

* Change the mouse cursor to a pointer when the scroll button appears in the library

Other pages:

* Add a "Get Started" page.

* Fix splash content alignment

* Hide site feedback message text on smaller devices

* Allow right clicking on dashboard tiles

* Display a success toast when a new featured exploration is added

I18N:

* Fix Indonesian translation

Emails:

* Add functionality for sending emails to existing users in bulk.

Dev tools:

* Determine Vagrant env by checking existence of a file and env var

* Fix flakiness when accepting alerts in Protractor tests

Code health:

* Refactor learner view

* Minimize calls to is_admin, static site_name and feedback_url

* Remove 'ALTERNATE' tag on translations

* Refactor ID generation procedure into a separate service.

* Separate the top navigation bar into its own directive

* Split up the admin page controller

* Update stripFormatting filter to preserve bold and italics

* Improve docstrings for gae_models.py

* Add docstrings for core.domain.stats_domain

* Add docstrings for core.domain.stats_jobs_continuous

* Add docstrings to gae_models.py

v2.3.5 (17 Oct 2016)

--------------------

Infrastructure and tests:

* Upgrade protractor to v4.0.9

* Add protractor tests to visit static pages and for logged-in flow

* Fix .load() method breakage due to jQuery upgrade

* Use one-time bindings for admin page

* Remove mail validation checks from mailgun email API

* Add docstrings to collection_services.py

I18N:

* Add Portuguese (Brazil) translation

UI fixes:

* Make notifications right-clickable

* Fix fallbacks triggering at the wrong time

* Don't allow 'featured' label to break into 2 lines

* Fix About page display on mobile

v2.3.4 (10 Oct 2016)

-------------------

Embedded explorations:

* Have a dedicated URL for iframed explorations.

* Make the embedding script minimal.

Creator Dashboard: