Fixed endpoint name I forgot when renaming them

server.py

@@ -143,7 +143,7 @@ def courses():
 
 @app.route('/course/<handle>')
 @app.route('/course/<int:id>')
-@handle_errors('course', 'Diese Veranstaltung existiert nicht!', 404, IndexError)
+@handle_errors('courses', 'Diese Veranstaltung existiert nicht!', 404, IndexError)
 def course(id=None, handle=None):
 	if id:
 		courses = query('SELECT * FROM courses WHERE id = ? AND (? OR visible)', id, ismod())[0]