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/sk/common.json

@@ -1019,7 +1019,6 @@
       "title": "E-mailové štítky",
       "description": "Definujte štítky na organizáciu e-mailov s farbami.",
       "add_keyword": "Pridať štítok",
-      "reset_defaults": "Obnoviť predvolené",
       "label_field": "Zobrazovaný názov",
       "label_placeholder": "napr. Práca, Osobné, Naliehavé",
       "id_field": "ID štítku",