v6.8.15: the Android app is out for testing

- Android APK download, served from securebit.chat (/downloads/, never
  committed): a "Download Android APK" badge next to the Snap Store one, drawn
  for both themes, and an Android entry in the download menu (recommended on
  Android devices). nginx serves .apk as an attachment; the service worker
  leaves /downloads/ alone. The APK version is one constant in three places,
  checked by tests/desktop-download-links.test.mjs.
- Roadmap versions follow the real releases: Group Communications v6.0
  shipped, Mobile Edition v6.8 is current, Quantum-Resistant v7.0 is in
  development (2027), then v8.0 and v9.0.
- "Download desktop app" is now "Download the app"; the "You're on Web" pill
  in the download menu is gone.

locales/fr.json

@@ -223,7 +223,7 @@
     ],
     "roadmap.r9.title": "Communication de groupe",
     "roadmap.r9.sub": "Discussions de groupe sans renoncer à la vie privée",
-    "roadmap.r9.date": "Maintenant",
+    "roadmap.r9.date": "Automne 2026",
     "roadmap.r9.features": [
       "Groupes P2P jusqu'à 8 participants",
       "Distribution en maillage, avec relais signé en secours",
@@ -236,7 +236,7 @@
     ],
     "roadmap.r10.title": "Mobile Edition",
     "roadmap.r10.sub": "Applications natives pour iOS et Android",
-    "roadmap.r10.date": "2e trimestre 2027",
+    "roadmap.r10.date": "Maintenant",
     "roadmap.r10.features": [
       "Application iOS native (Swift/SwiftUI)",
       "Application Android native (Kotlin/Jetpack Compose)",
@@ -249,7 +249,7 @@
     ],
     "roadmap.r11.title": "Édition résistante au quantique",
     "roadmap.r11.sub": "Protection contre les ordinateurs quantiques",
-    "roadmap.r11.date": "4e trimestre 2027",
+    "roadmap.r11.date": "2027",
     "roadmap.r11.features": [
       "Cryptographie post-quantique CRYSTALS-Kyber",
       "Signatures numériques SPHINCS+",
@@ -646,7 +646,7 @@
     "sec.simulatedWarning": "Attention : la connexion n'est peut-être pas entièrement établie - les valeurs peuvent être simulées.",
     "dl.title": "Télécharger SecureBit",
     "dl.free": "Gratuit · code ouvert",
-    "dl.soon": "Les applications mobiles (iOS, Android) et les extensions de navigateur (Chrome, Firefox, Opera) arrivent bientôt.",
+    "dl.soon": "L'application iOS et les extensions de navigateur (Chrome, Firefox, Opera) arrivent bientôt.",
     "chatHdr.chat": "Discussion",
     "chatHdr.chats": "Discussions",
     "chatHdr.newChat": "+ Nouvelle",
@@ -795,7 +795,6 @@
     "offline.disconnect": "Se déconnecter",
     "offline.learnMore": "En savoir plus",
     "pwa.installApp": "Installer l'application",
-    "chat.onWeb": "Vous êtes sur la version web",
     "groupCall.startVoice": "Démarrer un appel vocal de groupe",
     "groupCall.startVideo": "Démarrer un appel vidéo de groupe",
     "groupCall.join": "Rejoindre",