made texts more accessible, fixes #4022

app/controllers/course/studygroup.php

app/controllers/settings/settings.php

app/views/accessibility/forms/report_barrier.php

app/views/admin/plugin/edit_automaticupdate.php

app/views/course/enrolment/_priocourses.php

app/views/news/display.php

app/views/oer/admin/hosts.php

app/views/oer/market/licenseinfo.php

app/views/questionnaire/widget.php

app/views/resources/room_group/permissions.php

app/views/settings/notification.php

lib/admissionrules/termsadmission/templates/input.php

lib/classes/StudygroupModel.php

templates/check_object_exception.php

templates/login_emailactivation.php