Add English and Japanese translation

public/locales/en/translation.json

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+{
+    "header": {
+        "search": "Search"
+    },
+    "dropdown": {
+        "Options": "Options",
+        "Language": "Language",
+        "Account": "Account",
+        "Settings": "Settings",
+        "Instances": "Instances",
+        "Hub": "Hub",
+        "Apps": "Apps",
+        "Games": "Games",
+        "Openin": "Open in",
+        "LiteMode": "Lite Mode",
+        "YouTube": "YouTube",
+        "Invidious": "Invidious",
+        "Pipe": "Pipe",
+        "Other": "Other",
+        "About": "About",
+        "Privacy": "Privacy",
+        "SourceCode": "Source Code"
+    }
+}

public/locales/jp/translation.json

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+{
+    "header": {
+        "search": "検索"
+    },
+    "dropdown": {
+        "Options": "オプション",
+        "Language": "言語",
+        "Account": "アカウント",
+        "Settings": "設定",
+        "Instances": "インスタンス",
+        "Hub": "ハブ",
+        "Apps": "アプリ",
+        "Games": "ゲーム",
+        "Openin": "で開く",
+        "LiteMode": "ライトモード",
+        "YouTube": "YouTube",
+        "Invidious": "Invidious",
+        "Pipe": "Pipe",
+        "Other": "他の",
+        "About": "について",
+        "Privacy": "プライバシー",
+        "SourceCode": "ソースコード"
+    }
+}