Correct 31 French translations from a native-speaker review (#884)

[ryanbr]

Part of #884 — the issue stays open; see the completeness note at the end. @NoBrainNoHeadache — a native French speaker, first contribution — reviewed the catalogue's French and attached a corrected file. This applies it as a cherry-pick of exactly the 31 changed fr entries, not the wholesale file, for two reasons found in review:

• their base predated Ask the strap what a config key's VALUE is: a read-only device-config read probe (#103) #890, so wholesale replacement would have deleted 4 keys;
• Xcode's re-extraction had added 209 keys the catalogue deliberately does not carry.

What it fixes

Not polish — machine-translation output that was wrong to the point of nonsense:

key	old French	which means
RESTORATIVE SLEEP	POULET RESTORATOIRE	restorative chicken
"one-glance read"	lecture d'un verre	reading of a drinking glass
"Deep sleep pools HRV"	piscines de sommeil	swimming pools of sleep
HOURS OF SLEEP	HORAIRES DE DOUCEE	not a French word
RECOVERY	RECOUVREMENT	debt collection — the same error #902 found in Android's catalogue exists here too

Plus consistent terminology: HRV → VFC everywhere (replacing the invented VHR/VRH), RHR → FCR, strap → bracelet (replacing bande/sangle).

The change verified against code, not language

The bare "W"/"M" keys. Every localized use is case .week / case .month in seven range pickers — so their W→S (Semaine) / M→M (Mois) is correct, and the old French had M→L (someone's Monday→Lundi guess): French users have been seeing an L on a Month toggle. A translation fix that is also a UI bug fix.

Two integration repairs, both mechanical

1. The Charge explainer carried %6$lldcalculée — a positional %6$ against an English string with a single argument, so String(format:) reaches for a sixth argument that does not exist. Correction to an earlier revision of this description: the %6$ is NOT from the contributor's edit or Xcode's editor — it is on main today, and not only in French: German and Spanish carry the identical broken specifier (pt-PT is already correct). All three are repaired here to %lld (fr also gains its missing space); the es prose around it has separate MT damage (« de vez en cuando » for "from time in zones") noted on French translation updates and corrections for Localizable.xcstrings #884 rather than touched here.
2. All 31 arrived state=needs_review, which Tools/i18n_audit.py counts as untranslated — a straight merge would have hard-failed the fr focus-locale gate. Flipped to translated after reading all 31.

Verification

• Diff is 31 value lines and nothing else — checked, not assumed; serialization confirmed byte-stable before writing.
• Format specifiers verified preserved on the other 30.
• Only fr differs from main; no other locale touched.
• i18n --ci passes.

Completeness (added after a scoping re-check)

• +2 strings from the StrandDesign catalogue, same error class found by sweeping the other three Apple catalogues: GRADIENTS DE RECOUVREMENT → GRADIENT DE RÉCUPÉRATION, and Plongez pour lire le VHR ("dive to read") → Survolez pour lire la VFC. The two Watch catalogues are clean.
• Not in this PR, still open on French translation updates and corrections for Localizable.xcstrings #884: (a) the contributor also translated 209 un-extracted keys Xcode pulled from source — real work, preserved on the issue, adoptable only when those strings are extracted with the other focus locales filled; (b) Android'''s French has the same error classes at larger scale — VHR×7, RECOUVREMENT×1, sangle×80, bande×6 — and the sangle→bracelet sweep flips grammatical gender, so it needs a careful pass, not a sed.