Translate the whole project to English and fix outdated comments and help

Comments, docstrings, logs, CLI help, map UI, legends, PDF sheet, scripts,
compose files and AGENTS.md are now English. Data keys stay unchanged
(relief_oriente, densite_sol, visualisations/, API JSON keys, link params).
Wrong comments and help defaults found along the way are corrected.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

docs/DEPLOY_WEBAPP.md

@@ -135,10 +135,10 @@ tiles and maintains the pyramid at low priority — see `docs/MAPS.md`, section
 
 ### 3. Generating tiles from the map
 
-The **＋ Zone** ("Add area": draw a rectangle → IGN download + run on the
-worker), **⤒ Compléter** ("Complete": already-downloaded but incomplete
-tiles) and **↻ Générer cette dalle** ("Generate this tile": info panel on
-click) buttons are hidden if:
+The **Generation** tab (**＋ Area**: draw a rectangle → IGN download + run on
+the worker; **⤒ Complete**: already-downloaded but incomplete tiles) and the
+**↻ Generate this tile** button (Tile tab, after clicking a tile) are hidden
+if:
 
 - the browser's IP is outside `LIDAR_REGEN_CIDR` (default: loopback + private
   RFC1918 ranges; a comma-separated list of CIDRs, or an empty string to lift
@@ -150,7 +150,7 @@ click) buttons are hidden if:
 A request submitted while a run is already in progress is placed in a
 **queue** on the worker side (an in-progress job is never interrupted);
 progress is displayed tile by tile (orange/blue/red frames on the map) and the
-**Arrêter** ("Stop") button sends a SIGTERM to the pipeline. At the end of the
+**Stop** button sends a SIGTERM to the pipeline. At the end of the
 run, the map refreshes and pyramid maintenance resumes automatically.
 
 ### 4. Centering the map on the GPS position (phone)