How to change the OpenMrs language completely?

Although I set the settings to “en”, parts are displayed in german. What can this be?

Is this of help?

I checked it. Unfortuately, did not help.

You need to change the locale using the links at the footer of your browser as indicated on that wiki page.

I tried. It works for Spanish, but in English some German terms remain.

Are you able to reproduce this on the demo server?