Author: Jerome Mouneyrac
MDL-42028 EditPDF: replace the loading icon by a progress bar
http://git.moodle.org/gw?p=moodle.git;a=commit;h=aa3e4bdec76266e3ddad388f74694c878ffa7055
http://github.com/moodle/moodle/commit/aa3e4bdec76266e3ddad388f74694c878ffa7055
+ 2.6 en [generatingpdf,assignfeedback_editpdf]