Update ja.json (POEditor.com)

locales/ja.json

@@ -115,5 +115,7 @@
     "Help us translating on %s": "%s の翻訳にご協力ください",
     "Source Code": "ソースコード",
     "Register": "登録",
-    "Powered by %s": "Powered by %s"
+    "Powered by %s": "Powered by %s",
+    "Help us translating": "翻訳のお手伝いをお願いします",
+    "Join the community": "コミュニティに参加しましょう"
 }