Fix some duplicate message IDs in Bulk Importer. (#6850)

i18n/en.json

@@ -3060,11 +3060,11 @@
     "translation": "Could not find channel member when importing direct channel post"
   },
   {
-    "id": "app.import.import_direct_channel.create_direct_channel.error",
+    "id": "app.import.import_direct_post.create_direct_channel.error",
     "translation": "Failed to get direct channel"
   },
   {
-    "id": "app.import.import_direct_channel.create_group_channel.error",
+    "id": "app.import.import_direct_post.create_group_channel.error",
     "translation": "Failed to get group channel"
   },
   {