Set base for settings, add volatile settings for theme and language

Goal is to have a common and reusable base for the settings. Having nice styles and saving preferences is out of scope for now.

Note the conversation page is now the "main page" instead of the account settings.

Change-Id: I328686047d924642ae6781096c9f57308e8fea22
diff --git a/client/src/locale/fr/translation.json b/client/src/locale/fr/translation.json
index 23fb330..016df24 100644
--- a/client/src/locale/fr/translation.json
+++ b/client/src/locale/fr/translation.json
@@ -30,6 +30,9 @@
   "conversation_title_more": "{{member0}}, {{member1}}, {{member2}}, +{{excess}} autres membres",
   "dialog_close": "Fermer",
   "dialog_cancel": "Annuler",
+  "Menu": "Menu",
+  "settings_account": "Paramètres du compte",
+  "settings_general": "Paramètres généraux",
   "logout": "Se déconnecter",
   "username_input_helper_text_success": "Nom d'utilisateur disponible",
   "username_input_helper_text_taken": "Nom d'utilisateur déjà pris",
@@ -72,9 +75,14 @@
   "calling": "Appel vers {{member0}}",
   "connecting": "Connexion en cours...",
   "end_call": "Fin d'appel",
+  "incoming_call_medium": "",
   "refuse_call": "Refuser",
   "accept_call_audio": "Accepter en audio",
   "accept_call_video": "Accepter en vidéo",
+  "settings_title_general": "Général",
+  "settings_title_system": "Système",
+  "setting_dark_theme": "Thème sombre",
+  "setting_language": "Langue",
   "login_username_not_found": "Nom d'utilisateur introuvable",
   "login_invalid_password": "Mot de passe incorrect",
   "login_form_title": "Connexion",