Update public/unicaen/app/css/unicaen-icon.css

.icon.icon-sort-alpha:before {

    content:"\f15d";

}

.icon.icon-reduire:before,

.icon.icon-shrink:before {

    content: "\f78c";

}

.icon.icon-agrandir:before,

.icon.icon-enlarge:before {

    content: "\f31e";

}

.icon.icon-effacer:before,

.icon.icon-gommer:before,

.icon.icon-erase:before {

    content:"\f12d";

}