Verify connection when restoring messages

src/main/res/values-en/strings.xml

@@ -178,5 +178,6 @@
     <string name="err_kitkat_required">Android 4.4 or greater is required to use this feature.</string>
     <string name="error_make_default_sms_app">Please make this application default SMS application to permit restore your messages. This limitation has been introduced by Android 4.4.</string>
     <string name="x_messages_restored">messages restored...</string>
+    <string name="err_no_connection">No connection available, please ensure you have a valid data connection.</string>
 
 </resources>

src/main/res/values-fr/strings.xml

@@ -166,4 +166,5 @@
     <string name="err_sync_get_smslist">Erreur #1: Données invalides reçues lors de l\'obtention des messages précédents.</string>
     <string name="error_make_default_sms_app">Merci de bien vouloir mettre cette application en application SMS par défaut le temps de restaurer les messages. Cette limitation a été ajoutée depuis Android 4.4.</string>
     <string name="x_messages_restored">messages restaurés...</string>
+    <string name="err_no_connection">Aucune connexion disponible, assurez voir d\'avoir une connection de données valide.</string>
 </resources>

src/main/res/values/strings.xml

@@ -253,4 +253,5 @@
     <string name="err_kitkat_required">Android 4.4 or greater is required to use this feature.</string>
     <string name="restore_finished">SMS restauration is now finished.</string>
     <string name="x_messages_restored">messages restored...</string>
+    <string name="err_no_connection">No connection available, please ensure you have a valid data connection.</string>
 </resources>