feat: add right-click context menu to mail folders sidebar

locales/ko/common.json

@@ -1590,6 +1590,40 @@
     "items_selected": "{count}개의 메일 선택됨",
     "edit_draft": "임시보관 메일 수정"
   },
+  "mailbox_context_menu": {
+    "mark_folder_read": "Mark folder as read",
+    "mark_folder_tree_read": "Mark folder & subfolders as read",
+    "mark_all_folders_read": "Mark all folders as read",
+    "new_subfolder": "New subfolder...",
+    "new_folder": "New folder...",
+    "rename": "Rename...",
+    "empty_folder": "Empty folder",
+    "empty_folder_generic": "Empty folder",
+    "delete_folder": "Delete folder",
+    "refresh": "Refresh",
+    "mark_all_confirm_title": "Mark all folders as read",
+    "mark_all_confirm_message": "Mark every unread message in your personal account as read?",
+    "delete_confirm_title": "Delete folder",
+    "delete_confirm_message": "Permanently delete the folder \"{name}\"? This action cannot be undone.",
+    "prompt_new_subfolder": "New subfolder name:",
+    "prompt_new_folder": "New folder name:",
+    "prompt_rename": "Rename folder to:",
+    "toast_marked_read": "Folder marked as read",
+    "toast_marked_read_count": "Marked {count, plural, one {1 message} other {# messages}} as read",
+    "toast_already_read": "No unread messages",
+    "toast_marked_all_read": "All folders marked as read",
+    "toast_emptied": "Folder emptied",
+    "toast_folder_created": "Folder created",
+    "toast_folder_renamed": "Folder renamed",
+    "toast_folder_deleted": "Folder deleted",
+    "toast_error_mark_read": "Failed to mark as read",
+    "toast_error_empty": "Failed to empty folder",
+    "toast_error_create": "Failed to create folder",
+    "toast_error_rename": "Failed to rename folder",
+    "toast_error_delete": "Failed to delete folder",
+    "toast_error_delete_has_children": "Folder has subfolders. Remove them first.",
+    "toast_error_delete_has_email": "Folder is not empty. Empty it first."
+  },
   "shortcuts": {
     "title": "단축키",
     "tip": "언제든 ? 키를 누르면 이 도움말을 볼 수 있어요",