Hey, this is most likely due to a bug in the automatic conversion routine for the configuration of 8.2.0 and earlier (see [1]). I've committed a fix already that should prevent the execution with an empty locale after the release of 8.4.0; see [2].
The easiest workaround is to open the preferences and to close them again. That alone should change the internal setting for the translation from empty to a language. Alternatively remove the »uiLocale=« line from your »mkvtoolnix-gui.ini« file (~/.config/bunkus.org/mkvtoolnix-gui). Kind regards, mosu [1] https://github.com/mbunkus/mkvtoolnix/issues/1457 [2] https://github.com/mbunkus/mkvtoolnix/issues/1434 and
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