diff --git a/backend/src/emails/accountMultiRegistration/html.pug b/backend/src/emails/accountMultiRegistration/html.pug
index e285c940b..4c8a94d28 100644
--- a/backend/src/emails/accountMultiRegistration/html.pug
+++ b/backend/src/emails/accountMultiRegistration/html.pug
@@ -1,5 +1,5 @@
 doctype html
-html(lang="en")
+html(lang=locale)
   head
     title= t('emails.accountMultiRegistration.subject')
   body