Figure is an Block-Element -> http://w3c.github.io/html-reference/figure.html So there should be no p around it ;-)
Please explain the detailed changes you made here. Reference any issue number this pull request fixes.
@authors in touched PHP files@MacKP can you create the same PR for translated file https://github.com/MetaModels/attribute_translatedfile/blob/master/src/Resources/contao/templates/mm_attr_translatedfile_alternative.html5#L3
@zonky2 done: https://github.com/MetaModels/attribute_translatedfile/pull/29 ;-)