Don't default user timezone to UTC.

The Mconf::Timezone class will handle the nil case by setting the site timezone
Review all locale files to make them match for all languages

refs #1053
If a user is disabled and leaves spaces without admins, disable the spaces
Now it's possible to set a welcome message and layout in both space and users webconferences
Correct english grammar on conference exit message
Merge remote-tracking branch 'origin/branch-v2-small-corrections' into branch-v2

Conflicts:
	config/locales/pt-br/_simple_form.yml
Improvements in setting a room's welcome message

* Shorter textarea in my/edit_room
* Better placeholders that show the default welcome message
* Reviewed the strings in the locales

After 1200a58 and f54bb90f
Correct tests using the event factory

Also changing ffaker by faker that is used by mweb_events, has some
more useful methods and has been updated more recently.
Correct users_controller tests that failed when ran after others
Tests for user.events using after mweb_events
Correct digest_email events query
Use standard activerecord syntax for digest_mail query and remove deprecation message from tests
Added filters enabling events on tests that need events enabled
Update bigbluebutton_rails

Improves the way we prevent people from recording meetings.
Merge remote-tracking branch 'upstream/branch-v2' into branch-v2