Kstars for mac was impossible to switch the built-in language, for a long time.
We had been using an informal approach from the Mr. Mutlaq. Copying the Ubuntu Kstars Locate files named kstars.mo into Mac certain location ~/Library/Application Support/locale, as the example, ZhCN folder. Each time I do this when update the Kstars.As in 3.5.x Kstars for Mac, This method all works well.
Since 3.6.x, it is completely not working. In the past, you could switch the language, just the translation file was not correct, which we could fix it manually.