--- a/sat_frontends/quick_frontend/quick_app.py	Sun Jun 24 21:59:29 2018 +0200
+++ b/sat_frontends/quick_frontend/quick_app.py	Tue Jun 26 07:09:49 2018 +0200
@@ -793,19 +793,45 @@
         if type == "subscribed":
             # this is a subscription confirmation, we just have to inform user
             # TODO: call self.getEntityMBlog to add the new contact blogs
-            self.showDialog(_("The contact %s has accepted your subscription") % entity.bare, _('Subscription confirmation'))
+            self.showDialog(_(u"The contact {contact} has accepted your subscription")
+                            .format(contact=entity.bare), _(u'Subscription confirmation'))
         elif type == "unsubscribed":
             # this is a subscription refusal, we just have to inform user
-            self.showDialog(_("The contact %s has refused your subscription") % entity.bare, _('Subscription refusal'), 'error')
+            self.showDialog(_(u"The contact {contact} has refused your subscription")
+                              .format(contact=entity.bare),
+                            _(u'Subscription refusal'),
+                            'error')
         elif type == "subscribe":
             # this is a subscriptionn request, we have to ask for user confirmation
             # TODO: use sat.stdui.ui_contact_list to display the groups selector
-            self.showDialog(_("The contact %s wants to subscribe to your presence.\nDo you accept ?") % entity.bare, _('Subscription confirmation'), 'yes/no', answer_cb=self._subscribe_cb, answer_data=(entity, profile))
+            self.showDialog(_(u"The contact {contact} wants to subscribe to your presence"
+                              u".\nDo you accept ?").format(contact=entity.bare),
+                              _('Subscription confirmation'),
+                              'yes/no',
+                              answer_cb=self._subscribe_cb,
+                              answer_data=(entity, profile))
 
     def showDialog(self, message, title, type="info", answer_cb=None, answer_data=None):
+        """Show a dialog to user
+
+        Frontends must override this method
+        @param message(unicode): body of the dialog
+        @param title(unicode): title of the dialog
+        @param type(unicode): one of:
+            - "info": information dialog (callbacks not used)
+            - "warning": important information to notice (callbacks not used)
+            - "error": something went wrong (callbacks not used)
+            - "yes/no": a dialog with 2 choices (yes and no)
+        @param answer_cb(callable): method to call on answer.
+            Arguments depend on dialog type:
+            - "yes/no": argument is a boolean (True for yes)
+        @param answer_data(object): data to link on callback
+        """
+        # FIXME: misnamed method + types are not well chosen. Need to be rethought
         raise NotImplementedError
 
     def showAlert(self, message):
+        # FIXME: doesn't seems used anymore, to remove?
         pass  #FIXME
 
     def dialogFailure(self, failure):