Author: Stevani Andolo
MDL-78428 tiny_media: Implemented delete embed thumbnail preview
http://git.moodle.org/gw?p=moodle.git;a=commit;h=818f886c4e47c1caac09c740fe62a146235d7aa3
http://github.com/moodle/moodle/commit/818f886c4e47c1caac09c740fe62a146235d7aa3
+ 5.0 en [deletemediathumbnail,tiny_media]
+ 5.0 en [deletemediathumbnailwarning,tiny_media]