Yes, thank you very much, @jurgenhaas! Moments after my post I've found your suggestion in http://forum.mattermost.org/t/solved-how-to-authenticate-bots-using-the-api/2405/2 (I couldn't post the link in my edited post). That worked for me, too! 
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CLI crashes with error message: "panic: Failed to load system translations for 'en'"
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