Merge remote-tracking branch 'origin/3.7' into develop

htdocs/core/class/html.form.class.php

htdocs/langs/ar_SA/admin.lang

htdocs/langs/ar_SA/agenda.lang

htdocs/langs/ar_SA/categories.lang

htdocs/langs/ar_SA/compta.lang

htdocs/langs/ar_SA/contracts.lang

htdocs/langs/ar_SA/errors.lang

htdocs/langs/ar_SA/members.lang

htdocs/langs/ar_SA/products.lang

htdocs/langs/ar_SA/projects.lang

htdocs/langs/ar_SA/resource.lang

htdocs/langs/ar_SA/withdrawals.lang

htdocs/langs/bg_BG/admin.lang

htdocs/langs/bg_BG/agenda.lang

htdocs/langs/bg_BG/compta.lang

htdocs/langs/bg_BG/contracts.lang

htdocs/langs/bg_BG/errors.lang

htdocs/langs/bg_BG/members.lang

htdocs/langs/bg_BG/products.lang

htdocs/langs/bg_BG/projects.lang