Link fixes

Fixes reader button visible in detail view
Fix formats to convert (added htmlz)
Fix logger in updater
Added request "v3" of github api on update
Fix quotes parameter on external calls
E-Mail logger working more stable (also on python3)
Routing fixes
Change import in ub

cps/gdrive.py

@@ -70,7 +70,7 @@ def google_drive_callback():
             f.write(credentials.to_json())
     except ValueError as error:
         app.logger.error(error)
-    return redirect(url_for('configuration'))
+    return redirect(url_for('admin.configuration'))
 
 
 @gdrive.route("/gdrive/watch/subscribe")
@@ -102,7 +102,7 @@ def watch_gdrive():
             else:
                 flash(reason['message'], category="error")
 
-    return redirect(url_for('configuration'))
+    return redirect(url_for('admin.configuration'))
 
 
 @gdrive.route("/gdrive/watch/revoke")
@@ -121,7 +121,7 @@ def revoke_watch_gdrive():
         ub.session.merge(settings)
         ub.session.commit()
         config.loadSettings()
-    return redirect(url_for('configuration'))
+    return redirect(url_for('admin.configuration'))
 
 
 @gdrive.route("/gdrive/watch/callback", methods=['GET', 'POST'])