LDEV-5397 Migrate old Bootstrap3 class names into Bootstrap5 in *all* tools' learning* Did this following 2 guides:https://getbootstrap.com/docs/4.1/migration/https://getbootstrap.com/docs/5.2/migration/* Apart from changing class names, also performed other updates required in aforementioned guides.For instance, checkboxes, radios, selects have now proper Bootstrap5 structure; removed "media" objects.* Replaced some outdated LAMS class names
LDEV-2917: Change DOCTYPE tag of files which have not been picked up by previous runs as they had this tag broken into 2 lines and regex had not detected them.