Fix `indico plugindb` help
Fix localeselector (in tests, outside req ctx)
Travis: Install requirements using pip
Add to_unicode command
Fixed Transifex config
Add user_preferences signal
Autogenerate signals rst docs
Add flask+ZODB to doc requirements
Add flask-babelex to doc requirements
Remove helpers.py from the old IM plugin
Add event_registrant_changed signal
Add event_participant_changed signal
Add event_data_changed signal
Better documentation for participation change signal
Fix issue with currentLocale

And rename it to get_current_locale
Fix issue with lazy strings and DB

Resolution of language would fail in case there was not (yet) a DB connection
Skip rooms with non-existing location names
Make sure css/lib folder exists
Fix plugin list order

sort by title, not name
Improve NotFound handling

- Don't log a traceback for NotFound/NotFoundError
- Use a better default message when a user sees a NotFound error