Fix #1697: upgrade collection schema version to 2 by introducing language codes to collections (where the default is 'en'). #1856
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Introduced a language_code to the collection data structure and updated its schema version to 2, where new collection have a default language code of 'en'. The support for this language code has been implemented end-to-end for collections, including in the collection creation dialog and for search queries (though this commit does not implement collection searching).