fix: remove the reset-to-defaults button from tag settings

If you carefully crafted your tags and then click this button by accident, all
your hard work is gone. A confirmation message would be the other solution but
since I have difficulty to grasp when you would need such a button, I propose
to just remove it.

locales/de/common.json

@@ -1016,7 +1016,6 @@
       "title": "E-Mail-Labels",
       "description": "Labels definieren, um Ihre E-Mails mit Farben zu organisieren. Diese werden als JMAP-Keywords auf dem Server gespeichert.",
       "add_keyword": "Label hinzufügen",
-      "reset_defaults": "Auf Standard zurücksetzen",
       "label_field": "Anzeigename",
       "label_placeholder": "z.B. Arbeit, Privat, Dringend",
       "id_field": "Label-ID",