Fixed _follow_video_button javascript

The old code would work initially, but after you toggled the state,
then the hover logic and the dialog would be incorrect.  They would be
based off the initial state, not the changed state.
2195: fixed follow/unfollow code

Removed the automatic return True from the is_follower() tag.

Fixed the RPC code to import the new SubtitleLanguage model.  Removed
the change_title_translation() method.  It was using the old
SubtitleLanguage model and also not being called anymore (at least
according to grep).  I figure deletion is the best option here.
Remove escapejs call.

It just seems unnecessary.
Merge pull request #139 from bendk/x-2195

X 2195