Add ability to bulk import emoji (#9048)

* Add ability to bulk import emoji

* Improve error handling

* Update test config

i18n/en.json

@@ -2362,6 +2362,22 @@
     "id": "app.cluster.404.app_error",
     "translation": "Cluster API endpoint not found."
   },
+  {
+    "id": "app.import.emoji.bad_file.error",
+    "translation": "Error reading import emoji image file. Emoji with name: \"{{.EmojiName}}\""
+  },
+  {
+    "id": "app.import.validate_emoji_import_data.empty.error",
+    "translation": "Import emoji data empty."
+  },
+  {
+    "id": "app.import.validate_emoji_import_data.name_missing.error",
+    "translation": "Import emoji name field missing or blank."
+  },
+  {
+    "id": "app.import.validate_emoji_import_data.image_missing.error",
+    "translation": "Import emoji image field missing or blank."
+  },
   {
     "id": "app.import.bulk_import.file_scan.error",
     "translation": "Error reading import data file."