redirect to /editor/finalize and show edit and signin button

src/c3nav/editor/hosters/gitlab.py

@@ -2,6 +2,8 @@ from .base import Hoster
 
 
 class GitlabHoster(Hoster):
+    title = 'Gitlab'
+
     def __init__(self, app_id, app_secret, **kwargs):
         super().__init__(**kwargs)
         self._app_id = app_id