Added language and theme settings.

lang/ja-JP.json

@@ -28,6 +28,7 @@
   "label.enable-share-url": "共有リンクを有効にする",
   "label.invalid": "無効",
   "label.invalid-domain": "無効なドメイン",
+  "label.language": "Language",
   "label.last-days": "過去{x}日間",
   "label.last-hours": "過去{x}時間",
   "label.logged-in-as": "{username}でログイン中",
@@ -50,6 +51,7 @@
   "label.settings": "設定",
   "label.share-url": "共有リンク",
   "label.single-day": "一日のみ",
+  "label.theme": "Theme",
   "label.this-month": "今月",
   "label.this-week": "今週",
   "label.this-year": "今年",