Disable file-based updates vfor 0.12.0
Fix for #1800: for software updates, move updatesStart into ONLINE_ONLY case, so error message isn't cleared.

Conflicts:
	kalite/updates/static/js/updates/update_software.js
Cleanup of update_software: remove unnecessary callbacks, wrap strings in gettext/sprintf
Cleanup code to have consistent feel across files.

Conflicts:
	kalite/updates/static/js/updates/update_languages.js
	kalite/updates/static/js/updates/update_software.js
Add back callback to reboot.
Remove unused references to subtitle in css/js
check if we have the key of the central server first
always run collectstatic when we run kaserve