fixes #4133

app/controllers/activityfeed.php

app/controllers/admin/courses.php

app/controllers/admin/extern.php

app/controllers/admin/sem_classes.php

app/controllers/admin/user.php

app/controllers/blubber.php

app/controllers/contents/courseware.php

app/controllers/course/contentmodules.php

app/controllers/course/overview.php

app/controllers/course/wiki.php

app/controllers/file.php

app/controllers/files.php

app/controllers/institute/basicdata.php

app/controllers/privacy.php

app/controllers/profile.php

app/controllers/profilemodules.php

app/controllers/questionnaire.php

app/controllers/quickselection.php

app/controllers/start.php

app/views/course/details/index.php