feat(i18n): translate the whole interface

Mark every UI string the unmarked-text check reported (534) plus text it
cannot see (helpers, joined labels, runtime-built panels), and translate
the result to Spanish and Russian: 1,679 messages each.

- Kept on purpose, with the reason where the text lives: provider and
  product names, place and camera names, codes and units, dB values, the HUD
  terminal readouts, demo shot titles that saved projects look up by title,
  and text for AI tools and the voice model.
- Modules shared with the server or AI tools stay free of the i18n import
  (local msg); the wind reading and voice session stay English and are
  translated where the page shows them.
- npm test now runs the unmarked-text check.
- Fixes on the way: a duplicated radio privacy paragraph, the contact panel
  toggle saying Expand while open, the CSS filter mistaking & for CSS.

Co-Authored-By: Claude Opus 5.5 <[email protected]>
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German KhokhlovandClaude Opus 5.5 committed 2026-10-12 19:24:42 +04:00
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@@ -60,10 +60,10 @@ To see a language, open the app with `?lang=ru`, or use the language switch in t
## Text the check reports as unmarked
`npm run i18n` also lists UI text that is not marked at all, and fails while there is any:
`npm run i18n` also lists UI text that is not marked at all, and fails while there is any; `npm test` runs the same check:
- **Markup:** element text without `data-i18n`, and `title`, `aria-label` or `placeholder` without the matching `data-i18n-*`.
- **Code:** string literals that reach the page without `t()`, `tn()` or `msg()`: assigned to `textContent`, `innerText`, `innerHTML`, `title`, `placeholder`; passed to `setAttribute('title' | 'aria-label' | 'aria-valuetext' | 'placeholder' | 'alt', …)`, `createTextNode`, `insertAdjacentHTML`, `showToast`, `toast`, `setHint`, `announce`; or kept in `label:`, `title:`, `tooltip:`, `placeholder:`, `hint:`, `ariaLabel:`, `caption:`, `subtitle:`, `kicker:`, `emptyText:` properties.
- **Code:** string literals that reach the page without `t()`, `tn()` or `msg()`: assigned to `textContent`, `innerText`, `innerHTML`, `title`, `placeholder`; passed to `setAttribute('title' | 'aria-label' | 'aria-valuetext' | 'placeholder' | 'alt', …)`, `createTextNode`, `insertAdjacentHTML`, `showToast`, `toast`, `setHint`, `announce`; or kept in `label:`, `title:`, `tooltip:`, `placeholder:`, `hint:`, `ariaLabel:`, `caption:`, `subtitle:`, `kicker:`, `emptyText:`, `blurb:`, `countLabel:` properties.
Fix it by marking the text. When the text must stay as it is, say so where it lives: