diff --git a/inclure/entravaux.html b/inclure/entravaux.html
index a53a989c081a89f3f5442b0f62d3728a5573cc1e..ec930324994814780f1d2a0d80fc76c5f6d4d619 100644
--- a/inclure/entravaux.html
+++ b/inclure/entravaux.html
@@ -12,7 +12,7 @@
 <meta property="og:url" content="[(#SELF|url_absolue)]" />
 <meta property="og:site_name" content="[(#NOM_SITE_SPIP|textebrut)]" />
 [<meta property="og:description" content="(#DESCRIPTIF_SITE_SPIP|supprimer_tags|attribut_html)" />]
-<meta property="og:locale" content="[(#LANG|strtolower)]_[(#LANG|strtoupper)]" />
+<meta property="og:locale" content="[(#LANG|mb_strtolower)]_[(#LANG|mb_strtoupper)]" />
 [(#SET{logoreseauxsociaux,[(#LOGO_RUBRIQUE_NORMAL|sinon{#CHEMIN{images/nature-2683474_1920.jpg}}|image_focus{600,600}|extraire_attribut{src}|url_absolue)]})]
 [<meta property="og:image" content="(#GET{logoreseauxsociaux,#CHEMIN{images/1.gif}})" />]
 
diff --git a/noisettes/header/header.html b/noisettes/header/header.html
index 7e4ceb6ef553f4dbd687b62df67607bb36741c74..a1ce3c4adeaa9e9c7f10b595b950576e5fb61e3f 100644
--- a/noisettes/header/header.html
+++ b/noisettes/header/header.html
@@ -86,7 +86,7 @@ CancelMonitorTextSize = false;
 [<meta property="og:image" content="(#GET{logoreseauxsociaux,#CHEMIN{images/1.gif}})" />]
 <meta property="og:site_name" content="[(#NOM_SITE_SPIP|textebrut)]" />
 [<meta property="og:description" content="(#ENV{metadescription,[(#DESCRIPTIF_SITE_SPIP|supprimer_tags|attribut_html)]}|couper{150})" />]
-<meta property="og:locale" content="[(#LANG|strtolower)]_[(#LANG|strtoupper)]" />
+<meta property="og:locale" content="[(#LANG|mb_strtolower)]_[(#LANG|mb_strtoupper)]" />
 [(#REM) Twitter card]
 <meta property="twitter:card" content="summary_large_image" />
 <meta property="twitter:url" content="[(#SELF|url_absolue)]" />
diff --git a/soyezcreateurs_fonctions.php b/soyezcreateurs_fonctions.php
index f6bcd198674f851149363032fc9cf5905902daf3..6cc23610e5154e96f23de0e2fa0a5701d5a61ac9 100644
--- a/soyezcreateurs_fonctions.php
+++ b/soyezcreateurs_fonctions.php
@@ -136,7 +136,7 @@ function sc_nettoyer_marqueur($texte) {
 	$texte = preg_replace("#Â #", "_", $texte); 
 	$texte = preg_replace("#\s#", "_", $texte);
 	$texte = preg_replace("#_+#", "_", $texte);
-	return strtolower($texte);
+	return mb_strtolower($texte);
 }
 
 /* à appliquer au #TEXTE de forum */