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

The macOS Shut Down menu, with some text that is partially in Dutch

I tried adding and removing Dutch and English in the Language & Region System Preferences pane, but to no avail.

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What worked for me is following the instructions to change the language used at the login screen on your Mac, namely:

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

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