feat(ui): add locales and split catalogs

Adds Spanish, French, Russian, Japanese, and Simplified Chinese catalogs and wires supported locales into the i18n layer.

packages/ui/src/lib/i18n/messages/ja/dialogs.ts

@@ -0,0 +1,16 @@
+export const dialogMessages = {
+  "alertDialog.fallbackTitle.info": "お知らせ",
+  "alertDialog.fallbackTitle.warning": "ご確認ください",
+  "alertDialog.fallbackTitle.error": "問題が発生しました",
+  "alertDialog.actions.confirm": "確認",
+  "alertDialog.actions.run": "実行",
+  "alertDialog.actions.ok": "OK",
+  "alertDialog.actions.cancel": "キャンセル",
+  "alertDialog.prompt.inputLabel": "入力",
+
+  "backgroundProcessOutputDialog.title": "バックグラウンド出力",
+  "backgroundProcessOutputDialog.actions.close": "閉じる",
+  "backgroundProcessOutputDialog.loading": "出力を読み込み中...",
+  "backgroundProcessOutputDialog.truncatedNotice": "表示のため出力を省略しました。",
+  "backgroundProcessOutputDialog.loadErrorFallback": "出力の読み込みに失敗しました。",
+} as const