add instruments i18n

frontend/src/_locales/ja/main.json

@@ -282,5 +282,18 @@
   "Play": "再生",
   "New Track": "新規トラック",
   "Select a track to preview the content": "トラックを選択して内容をプレビュー",
-  "Save to generation area": "生成エリアに保存"
+  "Save to generation area": "生成エリアに保存",
+  "Piano": "ピアノ",
+  "Percussion": "パーカッション",
+  "Drum": "ドラム",
+  "Tuba": "チューバ",
+  "Marimba": "マリンバ",
+  "Bass": "ベース",
+  "Guitar": "ギター",
+  "Violin": "バイオリン",
+  "Trumpet": "トランペット",
+  "Sax": "サックス",
+  "Flute": "フルート",
+  "Lead": "リード",
+  "Pad": "パッド"
 }

frontend/src/_locales/zh-hans/main.json

@@ -282,5 +282,18 @@
   "Play": "播放",
   "New Track": "新建音轨",
   "Select a track to preview the content": "选择一个音轨以预览内容",
-  "Save to generation area": "保存到生成区"
+  "Save to generation area": "保存到生成区",
+  "Piano": "钢琴",
+  "Percussion": "打击乐",
+  "Drum": "鼓",
+  "Tuba": "大号",
+  "Marimba": "马林巴",
+  "Bass": "贝斯",
+  "Guitar": "吉他",
+  "Violin": "小提琴",
+  "Trumpet": "小号",
+  "Sax": "萨克斯",
+  "Flute": "长笛",
+  "Lead": "主音",
+  "Pad": "和音"
 }