diff --git a/locales/en.json b/locales/en.json
index 06b6af55..bf54ee67 100644
--- a/locales/en.json
+++ b/locales/en.json
@@ -122,6 +122,7 @@
     "confirm_install_domain_root" : "You will not be able to install any other app on %s. Continue ?",
     "app_install_cancel" : "Installation cancelled.",
     "confirm_install_custom_app" : "Installing 3rd party applications may compromise the security of your system. Use at your own risks.",
+    "app_install_custom_no_manifest" : "No manifest.json file",
 
     "backup" : "Backup",
     "backup_warning_title" : "The backup system is not implemented yet.",
diff --git a/locales/fr.json b/locales/fr.json
index cc746ba7..73aa4756 100644
--- a/locales/fr.json
+++ b/locales/fr.json
@@ -122,6 +122,7 @@
     "confirm_install_domain_root" : "Vous ne pourrez pas installer d'autres applications sur %s. Continuer ?",
     "app_install_cancel" : "Installation annulée.",
     "confirm_install_custom_app" : "L'installation d'application tierce peut comprometre la sécurité du système. Continuer à vos risques ?",
+    "app_install_custom_no_manifest" : "Aucun fichier manifest.json",
 
     "backup" : "Sauvegarde",
     "backup_warning_title" : "Le système de sauvegarde n'est pas encore implémenté.",