Fixed spelling error (#8153)

i18n/en.json

@@ -3372,7 +3372,7 @@
   },
   {
     "id": "app.import.validate_reaction_import_data.create_at_before_parent.error",
-    "translation": "Reactoin CreateAt property must be greater than the parent post CreateAt."
+    "translation": "Reaction CreateAt property must be greater than the parent post CreateAt."
   },
   {
     "id": "app.import.validate_reply_import_data.user_missing.error",