And another +1 for a language switcher back to English.
The half-translated German interface in git GUI has always annoyed me, and I hoped that Bazaar would be different.
As a developer I need to learn the English terms anyway, to report bugs, participate in discussions, google for help etc. There is little benefit in a translated interface, and by any means it should be optional and easy to switch to English. And this setting should be independent from other applications - I am happy to run my Office package in German.