Merge branch 'develop' of labs.maarch.org:maarch/MaarchCourrier into develop

modules/attachments/view_attachment.php

modules/templates/class/templates_controler_Abstract.php

modules/templates/datasources/letterbox_attachment.php

modules/templates/templates_ajax_content_for_mails.php

package.json

...ontend/app/list/summarySheet/summary-sheet.component.html

src/frontend/lang/lang-fr.ts