fix: .gitignore + add 44 language JSON files

languages/ja.json

@@ -0,0 +1,25 @@
+{
+  "app_title": "Lity3D エディタ",
+  "file": "ファイル",
+  "build": "ビルド",
+  "scene": "シーン",
+  "help": "ヘルプ",
+  "lang": "言語",
+  "new": "新規",
+  "open": "開く",
+  "save": "保存",
+  "exit": "終了",
+  "run": "ゲーム実行",
+  "compile": "ビルド",
+  "package": "EXE出力",
+  "explorer": "エクスプローラ",
+  "output": "出力",
+  "ready": "準備完了",
+  "running": "実行中...",
+  "saved": "保存済み",
+  "opened": "開いた",
+  "build_first": "先にビルド",
+  "kill": "停止済み",
+  "packaged": "パッケージ済み",
+  "about": "Lity3D について"
+}