Reverted endpoint renaming

All instances of url_for (especially in the templates) have to be checked
when an enpoint is renamed! In this case all course links were broken.

server.py

@@ -66,7 +66,7 @@ def index():
 
 @app.route('/course')
 @register_navbar('Videos', icon='film')
-def course():
+def videos():
 	courses = query('SELECT * FROM courses WHERE (? OR (visible AND listed))', ismod())
 	for course in courses:
 		if course['semester'] == '':
@@ -77,7 +77,7 @@ def course():
 	return render_template('course.html', courses=courses, groupedby=groupedby)
 
 @app.route('/course/<id>')
-def course_id(id):
+def course(id):
 	courses = query('SELECT * FROM courses WHERE ((handle = ?) or id = ?) AND (? OR visible)', id, id, ismod())
 	if not courses:
 		flash('Diese Veranstaltung existiert nicht!')