Accept key auth for ProjectsController#destroy (#6841).
Accept key auth for ProjectsController#update (#6841).
Accept key auth for ProjectsController#create (#6841).
Merged r4386 from trunk.
Backported r4357, r4358, r4360 and r4363 to r4367 from trunk.
Merged r4437 from trunk.
Prevents validation error when adding a user to a group (#6457).
Translations updates.
Merged r4428 from trunk.
Merged r4431 from trunk.
