Updated jQuery-UI version and replaced the included css with the official base style (the provided css would need some updates, while the official base seems to just work with more than the default admin).
Merge branch 'feature/update-tabs-example' into develop
Allow fallbacks to be temporarily disabled (using settings.ENABLE_FALLBACKS = False) for the exceptional case when one needs to check if there is a non-empty value for a particular language.
Merge branch 'feature/temporarily-disable-fallbacks' into develop

Conflicts:
	modeltranslation/settings.py