Overflow form input labels to new line.

Push input boxes to last line of label.
Fix for helptext overlap on input boxes.
solve #1495: fix lcode_to_django_lang to what django actually expects
Flow helptext to right of input boxes on forms.
Moved student management functions under securesync/users.

Fixed issues with endpoints and rendering of userlist.
Move userlist functionality inside securesync app.
Fix for translation issue in matching "Ungrouped" for userlist.
Include moved facility_user_management.js
Moving apps we modified heavily into the kalite folder
Warn user if no videos are available for that language.
Clear the "Loading topic tree" text and be more apologetic in language
Tweak apology language some more, avoid inserting raw html tags
do not clobber other get parameters when changing the users language
remove unused js CHANGE_*LANGUAGE_URL variables
fix the set_user_language get parameter
Moving i18n shared code into __init__.py instead.
Updating .gitignore to ignore partially downloaded dubbed videos.
for youtube-dl, download to a temporary dir before moving to content/
make the temp directory persistent throughout multiple scrape_video calls
remove outdated call to CHANGE_SERVER_LANGUAGE
add zip download size when upgrading