Index: branches/5.1.x/core/install/upgrades.sql
===================================================================
diff -u -N -r13476 -r13489
--- branches/5.1.x/core/install/upgrades.sql	(.../upgrades.sql)	(revision 13476)
+++ branches/5.1.x/core/install/upgrades.sql	(.../upgrades.sql)	(revision 13489)
@@ -1810,3 +1810,5 @@
 UPDATE Phrase
 SET l<%PRIMARY_LANGUAGE%>_Translation = 'Enable SEO-friendly URLs mode (MOD-REWRITE)'
 WHERE Phrase = 'la_config_use_modrewrite' AND l<%PRIMARY_LANGUAGE%>_Translation = 'Use MOD REWRITE';
+
+INSERT INTO ConfigurationValues VALUES(DEFAULT, 'UseContentLanguageNegotiation', '0', 'In-Portal', 'in-portal:configure_advanced', 'la_section_SettingsWebsite', 'la_config_UseContentLanguageNegotiation', 'checkbox', '', '', 10.023, 0, 0, NULL);
