change language
Mac OS 10.13.16 came in German.
System language changed to English using the GUI.
System language changed to English using the CLI: sudo languagesetup
However, I still have messages in German.
Any clue of what am I missing?
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Safe Boot, (holding Shift key down at startup), does the problem occur in Safe Mode?
Safe mode attempts to repair Disks & clears lots of caches & loads safe Drivers, & prevents loading of 3rd party extensions, so if Safe Mode works try again in regular boot.
To find out if it's system wide or user specific, try this...
Open System Preferences>Users & Groups, unlock the lock, click on the little plus icon, make a new admin account, log out & into the new account.
Does it work in the new account?