Resolve "Icons mit Zusätze ersetzen durch Icons ohne Zusätze"

app/controllers/admin/courses.php

app/controllers/admin/plugin.php

app/controllers/admin/statusgroups.php

app/controllers/admin/user.php

app/controllers/admission/restricted_courses.php

app/controllers/consultation/admin.php

app/controllers/contact.php

app/controllers/course/details.php

app/controllers/course/feedback.php

app/controllers/course/files.php

app/controllers/course/grouping.php

app/controllers/course/ilias_interface.php

app/controllers/course/management.php

app/controllers/course/members.php

app/controllers/course/overview.php

app/controllers/course/statusgroups.php

app/controllers/course/studygroup.php

app/controllers/course/topics.php

app/controllers/fachabschluss/abschluesse.php

app/controllers/fachabschluss/faecher.php