[felipemontenegro91]

The history list and the audio player still contain hard-coded English UI strings. They stay in English whatever language is selected (noticed while testing pt-BR, see #1213). This PR moves them to i18n keys and adds pt-BR translations.

What changes

Both components now use useTranslation, as their neighbours already do.

• HistoryTable.tsx:
  • visible status text: "Generating...", "Loading model...", "Failed";
  • the end-of-list message;
  • the failed-generations summary, now pluralised through i18next and with identical English output;
  • "Clear failed" / "Clearing...";
  • "from {{label}}" in the versions list;
  • row and button aria-labels.
• AudioPlayer.tsx: play/pause, loop, mute, volume, playback position (aria-valuetext included) and close labels and titles.
• en/translation.json: 34 new keys under history.* and audioPlayer.*. No existing English string was changed.
• pt-BR/translation.json: translations for all 34 keys. Other locales fall back to English through fallbackLng, so nothing changes for them.

Overlap with open PRs

• feat(i18n): add Russian translation (ru) #599 (ru) already moves four of these strings. This PR uses the same key names and identical English values (history.endOfList, history.status.failed, history.status.generating, history.status.loadingModel), so either PR can land first with a trivial conflict.
• feat(generation): provide real-time progress streaming and chunk tracking during synthesis (#760) #1024 changes the same "Generating..." status line to show progress, so expect a small conflict there.

Validation (on main 8af7efe + this branch)

• tsc --noEmit for app passes, and the web production build (tsc && vite build) passes.
• JSON checks pass: no duplicate keys; every new en key has a pt-BR value; {{...}} variables match between en and pt-BR.
• Biome 2.3.12 is clean on both locale files. The two components report the same 6 errors / 2 warnings before and after this change: pre-existing a11y/lint findings on unchanged structure, so none are introduced here.
• I did not run the desktop app from this branch. The strings were identified in the pt-BR UI of a v0.5.0 build, where they render in English.

CHANGELOG.md is intentionally unchanged, because it is generated. Suggested release note: "Localize remaining history list and audio player labels; add Brazilian Portuguese translations."

Prepared with AI assistance.

🤖 Generated with Claude Code