Log errors when bulk edit/copy fails (#13440).
Always instanciate a relation.
Moves Project#users to a regular method.
Moves Project#principals to a regular method.
Don't verify method.
Merged r11605 from trunk (#13301).
Prevent one query per User#member_of? call after r11508 (#13301).
Merged r11603 from trunk to 2.3-stable (#13447)
German translation changed by Filou Centrinov.
German translation changed by Filou Centrinov (#13447)
Merged r11599, r11600, r11601 from trunk to 2.3-stable (#13438)
