The german string in the field reads as "Weiter-suchen". The hyphen makes it weird. This has been changed a couple months ago and was fine before as far as I remember.
Please see attached screenshot.
This new "translation" popped up in the recent months and every time I see it it doesn't feel right at all.
How to reproduce the issue:
Open any Excel Online document with German language settings.
Press [CTRL] + [F] to open the search field.
Notice the button with the string "Weiter-suchen"
Please remove the hyphen in the string "Weiter-suchen" for the specified button.
Thanks for taking this into consideration.