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/nl/common.json

@@ -1018,7 +1018,6 @@
       "title": "E-maillabels",
       "description": "Definieer labels om uw e-mails met kleuren te organiseren. Deze worden opgeslagen als JMAP-trefwoorden op de server.",
       "add_keyword": "Label toevoegen",
-      "reset_defaults": "Standaardwaarden herstellen",
       "label_field": "Weergavenaam",
       "label_placeholder": "bijv. Werk, Persoonlijk, Urgent",
       "id_field": "Label-ID",