implemented feature #44
renamed title from approve events
Added column is_important to event
added field is_important to views: view, edit and create
merged master in Elch
Added important tag in requested bookings
Updated link to requested bookings in header
implemented feature #46
Merge branch 'Elch' into E/feature/#100

Conflicts:
	db/schema.rb
Merge branch 'Elch' into E/feature/#49

Conflicts:
	db/schema.rb
added test files for feature#49
Changed the way that the Important flag is displayed to a purple exclamation mark (Placeholder)
approve events uses status field instead of approved field
removed validation of data from events approval controller
added example data for event approval to db seeds
added rights for admin users to approve and decline events
replaced room links in event approval from room details to room events
updated seeds so that events can have multiple rooms
added translations for German and English
Merge branch 'E/feature/#49' into Elch