Translate the whole project to English and fix outdated comments and help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

docker-compose.cpu.yml

@@ -1,9 +1,9 @@
-# Surcharge pour une machine SANS GPU NVIDIA : retire `gpus: all` des services
-# de docker-compose.yml (sinon Docker refuse de démarrer : « failed to
-# discover GPU vendor from CDI »). Le pipeline bascule alors seul sur le CPU.
-# Utilisée automatiquement par ./start.sh ; à la main :
+# Override for a machine WITHOUT an NVIDIA GPU: removes `gpus: all` from the
+# docker-compose.yml services (otherwise Docker refuses to start: "failed to
+# discover GPU vendor from CDI"). The pipeline then falls back to the CPU on its own.
+# Used automatically by ./start.sh; by hand:
 #   docker compose -f docker-compose.yml -f docker-compose.cpu.yml up -d --build serve
-# `!reset` exige Docker Compose ≥ 2.24.
+# `!reset` requires Docker Compose >= 2.24.
 services:
   serve:
     gpus: !reset []