Mise à jour du composant moodle-theme_essential ESSENTIAl_26
Squashed 'theme/essential/' changes from 077baf0..fe10b80

REVERT: 077baf0 too many updates to count :)
REVERT: 836b106 removing header from pop-ups

git-subtree-dir: theme/essential
git-subtree-split: fe10b801fd0232969ccf76a43732805ed9696c73
Merge commit '2918f575e3a53692d094c564825e148d764be341' into test-MOODLE_25_STABLE
Mise à jour du composant moodle-theme_essential ESSENTIAL_26