MM-57824: Export/import custom status (#27361)

https://mattermost.atlassian.net/browse/MM-57824
```release-note
NONE
```

Co-authored-by: Mattermost Build <build@mattermost.com>

server/i18n/en.json

@@ -5122,6 +5122,10 @@
     "id": "app.import.bulk_import.unsupported_version.error",
     "translation": "Incorrect or missing version in the data import file. Make sure version is the first object in your import file and try again."
   },
+  {
+    "id": "app.import.custom_status.error",
+    "translation": "Unable to set custom status."
+  },
   {
     "id": "app.import.emoji.bad_file.error",
     "translation": "Error reading import emoji image file. Emoji with name: \"{{.EmojiName}}\""