My Shut Down menu is partially in English After macOS High Sierra 10.13.6 Supplemental Update 2, my Shut Down menu changed from Dutch to English, but only partially:



I tried adding and removing Dutch and English in the Language &amp; Region System Preferences pane, but to no avail.
What worked for me is following the instructions to change the language used at the login screen on your Mac, namely:


Switch to admin account
Open Terminal.app
Run sudo languagesetup
Enter 9 (which indicates Dutch, my preferred language)
Reboot