Fix crash in upgrade_new_members task

app/__init__.py

@@ -159,12 +159,11 @@ def get_locale():
 		locale = request.accept_languages.best_match(locales)
 
 	if locale and current_user.is_authenticated:
-		new_session = models.db.create_session({})()
-		new_session.query(models.User) \
-			.filter(models.User.username == current_user.username) \
-			.update({ "locale": locale })
-		new_session.commit()
-		new_session.close()
+		with models.db.create_session({})() as new_session:
+			new_session.query(models.User) \
+				.filter(models.User.username == current_user.username) \
+				.update({ "locale": locale })
+			new_session.commit()
 
 	return locale