i18n: the purpose filter (#771) speaks Japanese — the Usage and Routing pages' purpose picker landed with its zh strings only, written before 日本語 was added, so gui-ja failed on main (six strings missing in ja). They are added: すべての用途, 用途, 未記録, 不明な用途, its tooltip and the picker's title. gui-ja and purpose-filter pass on WebKit; go test ./internal/gui under a temp HOME passes.

internal/gui/assets/i18n.js

@@ -4419,6 +4419,12 @@ const I18N = {
     "Export CSV": "CSV をエクスポート",
     "Save every request listed, all pages, as a CSV file in Downloads": "一覧のリクエストを全ページ分、CSV ファイルとして「ダウンロード」フォルダに保存",
     "All agents": "すべてのエージェント",
+    "All purposes": "すべての用途",
+    "Purpose": "用途",
+    "Unmarked": "未記録",
+    "Unrecognized request purpose": "不明な用途",
+    "No purpose was recorded; this may be a conversation turn or an older record.": "用途が記録されていません。会話のターンか、古い記録の可能性があります。",
+    "Filter the request list by purpose": "リクエスト一覧を用途で絞り込む",
     "Agent": "エージェント",
     "Failed": "失敗",
     "{n} request": "{n} 件のリクエスト",