--- a/src/pyams_content/shared/view/interfaces.py	Mon Jan 14 17:29:43 2019 +0100
+++ b/src/pyams_content/shared/view/interfaces.py	Tue Jan 15 09:55:55 2019 +0100
@@ -34,13 +34,13 @@
 CREATION_DATE_ORDER = 'created_date'
 UPDATE_DATE_ORDER = 'modified_date'
 PUBLICATION_DATE_ORDER = 'publication_date'
-FIRSTPUBLICATION_DATE_ORDER = 'first_publication_date'
+FIRST_PUBLICATION_DATE_ORDER = 'first_publication_date'
 
 VIEW_ORDERS = (
     {'id': CREATION_DATE_ORDER, 'title': _("Published version creation date")},
     {'id': UPDATE_DATE_ORDER, 'title': _("Published version last update date")},
     {'id': PUBLICATION_DATE_ORDER, 'title': _("Current version publication date")},
-    {'id': FIRSTPUBLICATION_DATE_ORDER, 'title': _("First version publication date")}
+    {'id': FIRST_PUBLICATION_DATE_ORDER, 'title': _("First version publication date")}
 )
 
 VIEW_ORDER_VOCABULARY = SimpleVocabulary([SimpleTerm(item['id'], title=item['title'])
@@ -49,10 +49,10 @@
 
 USER_VIEW_ORDERS = (
     {'id': RELEVANCE_ORDER, 'title': _("Relevance (on user search)")},
-    {'id': CREATION_DATE_ORDER, 'title': _("Creation date")},
-    {'id': UPDATE_DATE_ORDER, 'title': _("Last update date")},
-    {'id': PUBLICATION_DATE_ORDER, 'title': _("Current publication date")},
-    {'id': FIRSTPUBLICATION_DATE_ORDER, 'title': _("First publication date")}
+    {'id': CREATION_DATE_ORDER, 'title': _("Published version creation date")},
+    {'id': UPDATE_DATE_ORDER, 'title': _("Published version last update date")},
+    {'id': PUBLICATION_DATE_ORDER, 'title': _("Current version publication date")},
+    {'id': FIRST_PUBLICATION_DATE_ORDER, 'title': _("First version publication date")}
 )
 
 USER_VIEW_ORDER_VOCABULARY = SimpleVocabulary([SimpleTerm(item['id'], title=item['title'])
@@ -109,7 +109,7 @@
                       description=_("Property to use to sort results"),
                       vocabulary=VIEW_ORDER_VOCABULARY,
                       required=True,
-                      default=FIRSTPUBLICATION_DATE_ORDER)
+                      default=FIRST_PUBLICATION_DATE_ORDER)
 
     reversed_order = Bool(title=_("Reversed order?"),
                           description=_("If 'yes', items order will be reversed"),