TIC 4392, closes #4392

app/views/course/details/index.php

app/views/shared/modul/overview.php

app/views/study_area/tree.php

lib/classes/JsonApi/Routes/RangeTree/RangeTreeIndex.php

lib/classes/JsonApi/Routes/StudyAreas/StudyAreasIndex.php

lib/classes/RangeTreeObject.php

lib/classes/RangeTreeObjectFak.php

lib/classes/RangeTreeObjectInst.php

lib/classes/SemBrowse.php

lib/classes/Seminar.php

lib/classes/StudipRangeTree.php

lib/classes/StudipRangeTreeView.php

lib/classes/StudipRangeTreeViewAdmin.php

lib/classes/StudipSemRangeTreeViewSimple.php

lib/classes/StudipSemSearch.php

lib/classes/StudipSemSearchHelper.php

lib/classes/StudipSemTree.php

lib/classes/StudipSemTreeSearch.php

lib/classes/StudipSemTreeView.php

lib/classes/StudipSemTreeViewAdmin.php