i18n pass: fix web-template extraction, wrap missing UI strings, AI-fill all translations

[brickbots]

An internationalization (i18n) pass over main. Three parts: a real extraction bug fix, wrapping user-visible strings that were missing _(), and filling every translation gap across all four languages.

1. Fix web-template extraction (the headline bug)

babel.cfg's Jinja2 mapping pointed at views2/ (which doesn't exist), and the extract command only scanned ./PiFinder — but the templates live in the sibling dir python/views/. Net effect: all 141 {{ _() }} strings across 19 web templates were silently never extracted, so the entire web UI fell back to English regardless of the selected language. The runtime path is wired up (server.py binds template _ to the device gettext catalog), so this was purely an extraction-config bug.

Fix: [jinja2: **.html] in babel.cfg + add ./views as a scan root in noxfile.py, and update the i18n skill docs to match. No user-visible change on its own — empty msgstr falls back to English — but it unblocks translating the web UI (see part 3).

2. Wrap missing device-UI strings + fix antipatterns

• menu_structure.py — Comets, Confirm, Cancel (their twins elsewhere were already wrapped, so these reuse existing msgids and translate immediately).
• location_list.py — action labels (Load/Rename/Delete) and the Loaded/Deleted/Renamed/Location-Name popups. English keys are kept for action dispatch; only the displayed label is translated (via a small label map), so the action == "Load" logic is unaffected in other locales.
• callbacks.py — Location Reset / Time-Date Reset / user-object popups.
• Antipatterns: object_details.py animated-ellipsis f-strings (a different msgid per frame → never translatable) now translate the base word and append dots outside _(); object_list.py drops a no-op double-_() wrap; software.py {} → named {mode}. f-string popups converted to named-placeholder .format().

3. AI-fill all translations (de / es / fr / zh)

Ran the babel pipeline against the corrected config (.pot: 508 → 666 msgids) and filled every untranslated + fuzzy entry — 181 each for de/es/fr, 186 for zh.

⚠️ These are machine translations and need human review. Each is tagged so you can find them:

grep -rn "AI-TRANSLATED" python/locale/

Placeholders, newlines, and the EQ / RA/Dec / Alt/Az / GPS abbreviations are preserved verbatim. One low-confidence zh entry (det {n}) is also flagged #, fuzzy so it falls back to English until reviewed. (The repo already carried AI-TRANSLATED markers from prior passes — this continues that workflow.)

Verification

• ruff check + ruff format ✓ · mypy ✓ (6 changed files) · msgfmt -c ✓ (all 4 languages)
• gettext runtime load resolves translations from the compiled .mo ✓
• 5 smoke + 530 unit tests pass ✓

Note on diff size

The .po files have large diffs. Most of it is unavoidable: 141 new template msgids + 181 filled translations/language + location-comment refresh from re-extraction. There's also cosmetic line-rewrap churn — pybabel 2.16.0 doesn't reproduce the committed files' prior wrapping at any --width, so any nox -s babel run reflows them. .mo binaries are regenerated (the repo checks them in).

🤖 Generated with Claude Code