I use RingCentral in the U.S. and my login screen is automatically switching from English to German, when I change the language on the top right it switches back to German. This happens in the browser and I can barely manage to send or receive faxes with another language even if I know where certain actions are located.
Try changing the Language settings of your browser. If using Google Chrome, you can try these steps:
1. Go to chrome://settings/
Settings 3. Click
Show advanced settings which is at the bottom of the page.
4. Look for
Language and input settings... 6. You will see these options (see image below).
German (if present). Add
English (if not present).
English, then click
Display Google Chrome in this language.