change url onclick
change buttons to english
Can add student with courseid from URL

Added functionality to add students to a course based on the course-id
in URL
Change url to include name of course aswell

In menulist, the acces-button now includes the name and courseid. So
page title shows the name of the course
change url to include course name in addstudent
change url on cancel-button
Echo current access
dropdown to change access
Merge remote-tracking branch 'origin/duggasys-CourseMenu' into duggasys-feature-studentview

Conflicts:
	DuggaSys/pages/addstudent.php
Fixed indentation
Removed a bunch of SQL injection vulnerabilities

Made it possible to delete users when needed (cascade some deletes).
Made the form make slightly more sense (it now selects the access the
user has).
Removed a number of SQL injection vulnerabilities.
Permission check in addstudent_ajax.php

Without this anyone can elevate themselves to teacher in a course,
that's bad.