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Jarmo: Contact support.
https://www.gog.com/support/contact/technical_issues_with_games/mount_blade_warband

The languages are probably mixed up in installation package.
You could also see if it runs in czech if you select hungarian, or something. :)
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Odius.314: Languages are not mixed. Franch, Germany, English and Turkish is ok, but other language have menu in good language, but the game is Turkish.
The Windows version should be fixed, please try updating either via Galaxy or downloading the latest patch for the game from your game shelf :)