My phone is setup to German. Also the openHAB-App settings are shown in German. Up to my upgrade to openHAB 4.0(.1), it was ok. But I had this effect today afternoon also on my computer, while working at the Unit-Settings of my battery status items (see above). Suddenly the device tab and the property tab switched to English and the translations are gone. Now I clean the browser cache, reload and everything is in German.
App:
Safari (macOS Ventura 13.5):
