diff --git a/sat/core/constants.py b/sat/core/constants.py
index 28a6346e..fd804dbe 100644
--- a/sat/core/constants.py
+++ b/sat/core/constants.py
@@ -233,6 +233,7 @@ class Const(object):
     TEMPLATE_TPL_DIR = u"templates"
     TEMPLATE_THEME_DEFAULT = u"default"
     TEMPLATE_STATIC_DIR = u"static"
+    KEY_LANG = u"lang"  # templates i18n
 
     ## Plugins ##