Update version for 0.12.1

Auditors: @alexwykoff

Merge pull request brave#3765 from cezaraugusto/add-newtab-detail

add newTab page state

don't initialize update log path on require

set `userData` earlier to prevent problems in the future
auditors: @bbondy

Merge pull request brave#3698 from brave/0_12_0_release_notes

Added release notes for 0.12.0

Tweak bitcoin handler to new api

Auditors: @bridiver

Fix brave#3625

Test Plan: Test that bitcoin handler still works.  Backup your Brave appdata user dir. Remove it. Make sure you can successfully register a bitcoin handler.

Update l10n

Auditors: @aekeus

We may have to an API method that uploads in addition to the automatic,
support from transifex suggested that, but I pushed back since we pay a
lot for our plan. I asked them to add a button to force update now.

Changelog tweaks

Auditors: @alexwykoff

Test Plan: n/a

General feedback for future release notes:

Major new features at the top: Autofill is a major feature highlight but
wasn’t listed, so should be at the top.  A sub-fix of it was listed
under fixes.

Sub-fixes for a new feature: about:history is a new feature so sub-fixes
related to that  aren’t needed in release notes.  Ditto ledger stuff.

Exclude Tests: Anything that mentions fixing automated tests or tests
shouldn’t be included.  In general anything dev relatd doesn't need to
be included.

Some reformatting of titles needed so that a casual reader can
understand it, remove sub-references to other issues inside titles.

Duplicate bugs: “Fixed new tab button too high” and “Fixed new tab
button position fixes brave#3208” are too similar so just mention one of them

Simplify some titles: “Fixed Make targets.host UNIQUE, which
auto-creates index” -> “Optimize HTTPS Everywhere”

Remove text like “Like other browsers do” from titles

Consistent naming of main features “non script” “noScript” -> “NoScript”

Always end lines in a period.

Thanks!

Don't disable insecure check

Also fixes a small bug with formatting of tag

Auditors: @aekeus

Test Plan: n/a

Disable placeholders by default

Adutiors: @bsclifton

Fix brave#3506

Release notes tweaks

Auditors: @alexwykoff