Hi Lars,
I am experiencing the same problem. I live in France and Kstars language is locked in french.
I already reported the bug and Jasem confirmed the issue (bugs.kde.org/show_bug.cgi?id=458412).
See also this topic: www.indilib.org/forum/ekos/12275-how-do-...nu-doesn-t-work.html.
Pierre-Yves

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