Merged r11389 from trunk to 2.2-stable.
add "tmp:clear" to "ci:setup" rake task for translation.
Portuguese translation for trunk updated by Rui Rebelo (#13206)
Portuguese translation changed by Rui Rebelo (#13206)
Portuguese translation for 2.2-stable updated by Rui Rebelo (#13207, #13206)
German "label_follows" translation changed by Daniel Felix (#13203)
Traditional Chinese translation updated and changed by ChunChang Lo (#13198)
Russian "almost_x_years" changed by Mikhail Velkin (#12645)
German translation updated by Daniel Felix (#13202)
fix typo at app/models/user.rb (#5719)
Contributed by Tom Copeland.
Optimizes the SQL query behind Principal#member_of.
