StEP 1800 closes #1800

...extern/elements/ExternElementLinkInternTemplate.class.php

lib/extern/elements/ExternElementList.class.php

...xtern/elements/ExternElementPersondetailsHeader.class.php

...ern/elements/ExternElementPersondetailsLectures.class.php

...ents/ExternElementPersondetailsLecturesTemplate.class.php

...ern/elements/ExternElementRangeTreeLevelContent.class.php

...extern/elements/ExternElementRangeTreeLevelName.class.php

...extern/elements/ExternElementReplaceTextSemType.class.php

lib/extern/elements/ExternElementSelectInstitutes.class.php

...extern/elements/ExternElementSelectSubjectAreas.class.php

lib/extern/elements/ExternElementStudipInfo.class.php

lib/extern/elements/ExternElementStudipLink.class.php

lib/extern/elements/ExternElementTableFooter.class.php

lib/extern/elements/ExternElementTableGroup.class.php

lib/extern/elements/ExternElementTableHeader.class.php

lib/extern/elements/ExternElementTableHeadrow.class.php

lib/extern/elements/ExternElementTableParagraph.class.php

...rn/elements/ExternElementTableParagraphHeadline.class.php

...elements/ExternElementTableParagraphSubHeadline.class.php

...extern/elements/ExternElementTableParagraphText.class.php