[Merge] lp:~barry/mailman.client/bilingual into lp:mailman.client

[Florian Fuchs]

Hi Barry, 

thank you very much for this change! I ran the tests like described in TESTING.rst and also did some manual testing with fresh checkouts of the core, client and postorius. Worked like a charm. 

I talked to Aurélien today about whether to wait with this merge until we have corresponing tests in Postorius and Hyperkitty. But we agreed that we better merge this branch now and then take care of Postorius and HK. 

Flo
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https://code.launchpad.net/~barry/mailman.client/bilingual/+merge/245537
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