Created attachment 140500 [details] Language interface cannot be converted SUMMARY Language interface cannot be converted Only English interface option Unable to convert Chinese interface(zh_TW) STEPS TO REPRODUCE 1. HELP 2. Configure Language SOFTWARE/OS VERSIONS macOS: 10.14.6 ADDITIONAL INFORMATION
Works for me with the Linux version. Since you're using the Mac version I suppose this means that the necessary languages aren't embedded in the binary automatically.
They're probably embedded in the app bundle (not the binary ;) ) but it seems not unlikely that they runtime (the ki18n framework?) looks for them in a different place (at least that could be the issue if the framework uses QStandardPaths instead of Qt's own translation files mechanism).
Sorry about this issue. This kept happening over and over because I had to remember each time I built the dmg to build the translations separately and manually include them. I have updated KStars to automatically include kstars translations when built on MacOS from now on, so this should no longer be an issue.