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/es/common.json

@@ -1016,7 +1016,6 @@
       "title": "Etiquetas de correo",
       "description": "Define etiquetas para organizar tus correos con colores. Se almacenan como palabras clave JMAP en el servidor.",
       "add_keyword": "Añadir etiqueta",
-      "reset_defaults": "Restablecer valores predeterminados",
       "label_field": "Nombre para mostrar",
       "label_placeholder": "ej. Trabajo, Personal, Urgente",
       "id_field": "ID de etiqueta",