One can remove a language from the .xcstrings file through the .xcodeproj file, under Localization → (-) [Language]. The .xcstrings file seems to lack a minus (-) Button. However, in my project I could remove a language like this: I added the language ("L") in the .xcstrings file to test it. After some time, the language L showed up in .xcodeproj file, under Localization. ❗️3. Here, there is a (+) and a (-) button, I selected the language L and removed it using the (-) button.❗️ After some time again, the language L did not appear in the .xcstrings file anymore. I assume it takes some time to synchronize between .xcstrings and .xcodeproj. Best, Tim :)