Kill DISABLE_RESET_EMAIL_TEST flag

We're better served by just directly testing if we're in the LMS or not.
Translate strings in LMS Underscore templates
Merge pull request #5458 from edx/andya/lms-underscore-i18n

Translate strings in LMS Underscore templates
Merge pull request #5457 from edx/kill-DISABLE_RESET_EMAIL_TEST-flag

Kill DISABLE_RESET_EMAIL_TEST flag
TNL-172: Change type of a previously posted post.
Make the thread_type field updatable.
Make sure 'Marked as Answer/Unmark as answer' is present when thread type is question and not when thread type is discussion.
Update ThreadView on save.
Fixed Jasmine unit tests.
Addressed some comments.
Update sidebar after endorsements get cleared.
Recreate DiscussionThreadView from containing view on thread:thread_type_updated event.