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/ca/common.json

@@ -325,13 +325,13 @@
     "view_contact": "Mostra el contacte",
     "message_details": "Detalls del missatge",
     "more_reply_options": "Més opcions de resposta",
-    "set_color": "Estableix l'etiqueta",
+    "set_tag": "Estableix l'etiqueta",
     "tag": "Etiqueta",
     "more_actions": "Més accions",
     "previous": "Anterior",
     "next": "Següent",
     "move_to": "Mou a...",
-    "remove_color": "Elimina l'etiqueta",
+    "remove_tag": "Elimina l'etiqueta",
     "more_count": "+{count} més",
     "characters_count": "{count} caràcters",
     "quick_reply_placeholder": "Escriviu una resposta ràpida...",
@@ -425,17 +425,6 @@
       "message_id": "ID del missatge",
       "list_info": "Informació de la llista"
     },
-    "color_tag": {
-      "title": "Etiqueta de color",
-      "red": "Vermell",
-      "orange": "Taronja",
-      "yellow": "Groc",
-      "green": "Verd",
-      "blue": "Blau",
-      "purple": "Lila",
-      "pink": "Rosa",
-      "none": "Cap"
-    },
     "tooltips": {
       "reply": "Respon (r)",
       "reply_all": "Respon a tots (a)",
@@ -2001,8 +1990,7 @@
     "delete": "Suprimeix",
     "mark_as_spam": "Denuncia com a brossa",
     "not_spam": "No és brossa",
-    "color_tag": "Etiqueta",
-    "remove_color": "Elimina l'etiqueta",
+    "tag": "Etiqueta",
     "items_selected": "{count} correus seleccionats",
     "edit_draft": "Edita l'esborrany",
     "cancel_scheduled_send": "Cancel·la l'enviament",