fix Japanese translation

Author: tealgreen0503

material/partials/languages/ja.html

@@ -50,7 +50,7 @@
   "select.version": "バージョン切り替え",
   "source": "リポジトリへ",
   "source.file.contributors": "投稿者",
-  "source.file.date.created": "作成した",
+  "source.file.date.created": "作成日",
   "source.file.date.updated": "最終更新日",
   "tabs": "タブ",
   "toc": "目次",