[web] locales: update German translations

Co-authored-by: Jakob Ackermann <jakob.ackermann@overleaf.com>
Co-authored-by: Sasha Goebbels <sasha.goebbels@overleaf.com>
Co-authored-by: Gernot Schulz <gernot.schulz@overleaf.com>
Co-authored-by: leo22 <87432648+leo-022@users.noreply.github.com>
GitOrigin-RevId: ce6d6e677bac29450989404c0b5ce41766fcbf96