feat: improve visualization of tags

Previously tags where very much focused on color coding email and less about
adding additional information. They were also visualized in different ways in
different locations.

This commit gets rid of all "Color-coding" references, aligns visualization of
the tags across the whole project and tries to improve user experience of using
tags in general.

A search box is shown in the tagging control so the user can quickly search for
a tag if they have a huge (more than 10) amount of tags.

locales/es/common.json

@@ -325,11 +325,11 @@
     "view_contact": "Ver contacto",
     "message_details": "Detalles del Mensaje",
     "more_reply_options": "Más opciones de respuesta",
-    "set_color": "Establecer etiqueta",
+    "set_tag": "Establecer etiqueta",
     "tag": "Etiqueta",
     "more_actions": "Más acciones",
     "move_to": "Mover a...",
-    "remove_color": "Eliminar etiqueta",
+    "remove_tag": "Eliminar etiqueta",
     "more_count": "+{count} más",
     "characters_count": "{count} caracteres",
     "quick_reply_placeholder": "Escriba una respuesta rápida...",
@@ -398,17 +398,6 @@
       "message_id": "ID del Mensaje",
       "list_info": "Información de Lista"
     },
-    "color_tag": {
-      "title": "Etiqueta de Color",
-      "red": "Rojo",
-      "orange": "Naranja",
-      "yellow": "Amarillo",
-      "green": "Verde",
-      "blue": "Azul",
-      "purple": "Morado",
-      "pink": "Rosa",
-      "none": "Ninguno"
-    },
     "tooltips": {
       "reply": "Responder",
       "reply_all": "Responder a todos (a)",
@@ -2033,8 +2022,7 @@
     "delete": "Eliminar",
     "mark_as_spam": "Reportar spam",
     "not_spam": "No es spam",
-    "color_tag": "Etiqueta",
-    "remove_color": "Eliminar etiqueta",
+    "tag": "Etiqueta",
     "items_selected": "{count} correos seleccionados",
     "edit_draft": "Editar borrador",
     "cancel_scheduled_send": "Cancelar envío",