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/ko/common.json

@@ -325,13 +325,13 @@
     "view_contact": "연락처 보기",
     "message_details": "메시지 상세 정보",
     "more_reply_options": "답장 옵션 더보기",
-    "set_color": "태그 설정",
+    "set_tag": "태그 설정",
     "tag": "태그",
     "more_actions": "작업 더보기",
     "previous": "이전",
     "next": "다음",
     "move_to": "이동...",
-    "remove_color": "태그 제거",
+    "remove_tag": "태그 제거",
     "more_count": "+{count}개 더보기",
     "characters_count": "{count}자",
     "quick_reply_placeholder": "간단하게 답장을 작성해 보세요...",
@@ -400,17 +400,6 @@
       "message_id": "메시지 ID",
       "list_info": "목록 정보"
     },
-    "color_tag": {
-      "title": "색상 태그",
-      "red": "빨간색",
-      "orange": "주황색",
-      "yellow": "노란색",
-      "green": "초록색",
-      "blue": "파란색",
-      "purple": "보라색",
-      "pink": "분홍색",
-      "none": "없음"
-    },
     "tooltips": {
       "reply": "답장 (r)",
       "reply_all": "전체 답장 (a)",
@@ -2033,8 +2022,7 @@
     "delete": "삭제",
     "mark_as_spam": "스팸 신고",
     "not_spam": "정상 메일",
-    "color_tag": "태그",
-    "remove_color": "태그 제거",
+    "tag": "태그",
     "items_selected": "{count}개의 메일 선택됨",
     "edit_draft": "임시보관 메일 수정",
     "cancel_scheduled_send": "보내기 취소",