diff -r 7a2af6e086a6 -r 4fafaf94701d src/pyams_content/features/alert/zmi/container.py
--- a/src/pyams_content/features/alert/zmi/container.py	Wed Jun 06 13:16:18 2018 +0200
+++ b/src/pyams_content/features/alert/zmi/container.py	Wed Jun 06 13:32:14 2018 +0200
@@ -155,7 +155,7 @@
 class AlertContainerHeaderColumn(I18nColumn, I18nAttrColumn):
     """Alert container header column"""
 
-    _header = _("Header")
+    _header = _('alert-header', default="Heading")
     attrName = 'header'
     weight = 20