fix empty translations

i18n/ja.json

@@ -9345,18 +9345,18 @@
   },
   {
     "id": "common.parse_error_int64",
-    "translation": ""
+    "translation": " "
   },
   {
     "id": "app.last_accessible_post.app_error",
-    "translation": ""
+    "translation": " "
   },
   {
     "id": "app.upload.upload_data.gen_info.app_error",
-    "translation": ""
+    "translation": " "
   },
   {
     "id": "app.post.cloud.get.app_error",
-    "translation": ""
+    "translation": " "
   }
 ]