Search button will now resize to fit text.
making make_request more robust to always return a string, cleaning up error output
Tweak to use proper language code format
Correcting type-o in gettext
Fix killer bug in subtitles download (all subtitles interpreted as errors)
Fixed bugs in lang code formats for getting & storing KA pre-compiled exercises.
Merge pull request #1294 from ruimalheiro/search-button

Search button will now resize to fit text.
Must ignore khan-exercises when generating djangojs.po
Merge branch 'develop' of github.com:learningequality/ka-lite into 590

Conflicts:
	kalite/i18n/management/commands/generate_subtitle_map.py