New : language support for knowledgemanagement module

htdocs/install/mysql/migration/13.0.0-14.0.0.sql

@@ -596,3 +596,4 @@ create table llx_onlinesignature
   pathoffile				varchar(255)
 )ENGINE=innodb;
 
+ALTER TABLE llx_knowledgemanagement_knowledgerecord ADD default_lang varchar(6)

htdocs/install/mysql/tables/llx_knowledgemanagement_knowledgerecord.sql

@@ -21,6 +21,7 @@ CREATE TABLE llx_knowledgemanagement_knowledgerecord(
 	date_creation datetime NOT NULL, 
 	tms timestamp, 
 	last_main_doc varchar(255), 
+	default_lang varchar(6),
 	fk_user_creat integer NOT NULL, 
 	fk_user_modif integer, 
 	fk_user_valid integer,