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/pt/common.json

@@ -1016,7 +1016,6 @@
       "title": "Etiquetas de e-mail",
       "description": "Defina etiquetas para organizar os seus e-mails com cores. São armazenadas como palavras-chave JMAP no servidor.",
       "add_keyword": "Adicionar etiqueta",
-      "reset_defaults": "Restaurar padrões",
       "label_field": "Nome de exibição",
       "label_placeholder": "ex. Trabalho, Pessoal, Urgente",
       "id_field": "ID da etiqueta",