i18n: Sync translations from Transifex

Thanks as always to our kind volunteer translators.

Author: chrisbobbe

static/translations/messages_fr.json

@@ -1,5 +1,5 @@
 {
-  "Invisible mode": "Invisible mode",
+  "Invisible mode": "Mode invisible",
   "{num_of_people, plural,\n  one {This message has been <z-link>read</z-link> by {num_of_people} person:}\n  other {This message has been <z-link>read</z-link> by {num_of_people} people:}}": "{num_of_people, plural,\n  one {Ce message a été<z-link> lis</z-link> par {num_of_people} personne :} many {Ce message a été<z-link> lis</z-link> par {num_of_people} personnes :} other {Ce message a été<z-link> lu</z-link> par {num_of_people} personnes :}}",
   "View read receipts": "Afficher les confirmations de lecture",
   "Failed to show read receipts": "Échec de l&#39;affichage des confirmations de lecture",
@@ -134,9 +134,9 @@
   "Unmute stream": "Ne plus rendre le canal muet",
   "No Internet connection": "Pas de connexion Internet",
   "Please check your Internet connection": "Veuillez vérifier votre connexion internet",
-  "Zulip’s Internet connection is uncertain.": "Zulip’s Internet connection is uncertain.",
-  "Zulip is offline.": "Zulip is offline.",
-  "Zulip is online.": "Zulip is online.",
+  "Zulip’s Internet connection is uncertain.": "La connexion Internet de Zulip est incertaine.",
+  "Zulip is offline.": "Zulip est déconnecté.",
+  "Zulip is online.": "Zulip est en ligne.",
   "{realm} is running Zulip Server {serverVersion}, which is unsupported. Please upgrade your server as soon as possible.": "{realm} exécute Zulip Server {serverVersion}, qui n'est pas pris en charge. Veuillez mettre à jour votre serveur dès que possible.",
   "{realm} is running Zulip Server {serverVersion}, which is unsupported. Please contact your administrator about upgrading.": "{realm} exécute Zulip Server {serverVersion}, qui n'est pas pris en charge. Veuillez contacter votre administrateur au sujet d'une mise à niveau.",
   "Learn more": "En apprendre plus",
@@ -301,7 +301,7 @@
   "Always": "Toujours",
   "Never": "Jamais",
   "Only in conversation views": "Uniquement dans les vues de conversations",
-  "Messages will be automatically marked as read only when viewing a single topic or private message conversation.": "Messages will be automatically marked as read only when viewing a single topic or private message conversation.",
+  "Messages will be automatically marked as read only when viewing a single topic or private message conversation.": "Les messages seront automatiquement marqués comme étant en lecture seule lors de l&#39;affichage d&#39;un sujet unique ou d&#39;une conversation  privée.",
   "Topics": "Sujets",
   "Add subscribers": "Ajouter des abonnés",
   "Subscribe": "S'abonner",