Fix typos for model.config.is_valid...app_error (#5236)

i18n/en.json

@@ -3585,11 +3585,11 @@
   },
   {
     "id": "model.config.is_valid.time_between_user_typing.app_error",
-    "translation": "Time btween user typing updates should not be set less than 1000 milliseconds."
+    "translation": "Time between user typing updates should not be set to less than 1000 milliseconds."
   },
   {
     "id": "model.config.is_valid.cluster_email_batching.app_error",
-    "translation": "Unable to enable email batching when clustering is enabled"
+    "translation": "Unable to enable email batching when clustering is enabled."
   },
   {
     "id": "model.config.is_valid.email_batching_buffer_size.app_error",