add docblocks, closes #1653

app/views/admin/datafields/index.php

app/views/admin/datafields/new.php

app/views/admin/datafields/preview.php

app/views/admin/datafields/type_select.php

app/views/admin/domain/edit.php

app/views/admin/domain/index.php

app/views/admin/holidays/edit.php

app/views/admin/holidays/index.php

app/views/admin/ilias_interface/add_ilias.php

app/views/admin/ilias_interface/edit_content.php

app/views/admin/ilias_interface/edit_interface_settings.php

app/views/admin/ilias_interface/edit_permissions.php

app/views/admin/ilias_interface/edit_server.php

app/views/admin/ilias_interface/index.php

app/views/admin/ilias_interface/soap_methods.php

app/views/admin/install/index.php

app/views/admin/install/install-basic.php

app/views/admin/install/install.php

app/views/admin/install/layout.php

app/views/admin/install/mysql.php