Add wrapper method for adding owner

Issue #1000
Signed-off-by: Michal Čihař <michal@cihar.com>

weblate/trans/models/project.py

@@ -201,6 +201,10 @@ class Project(models.Model, PercentMixin, URLMixin, PathMixin):
         group = Group.objects.get(name=self.name)
         user.groups.add(group)
 
+    def add_owner(self, user):
+        """Adds owner to the project"""
+        self.owners.add(user)
+
     def remove_user(self, user):
         """Adds user based on username of email."""
         group = Group.objects.get(name=self.name)

weblate/trans/views/acl.py

@@ -53,7 +53,7 @@ def make_owner(request, project):
     obj, form = check_user_form(request, project)
 
     if form is not None:
-        obj.owners.add(form.cleaned_data['user'])
+        obj.add_owner(form.cleaned_data['user'])
 
     return redirect_param(
         'project',