ref_language::apm::add_language_639_2_codes       Fills language_639_2_codes The ISO-639-2 codes are in a dat file located at ref-language/sql/commjon directory. 
ref_language::apm::after_install       Fill ISO-639-2 codes table 
ref_language::apm::after_upgrade        
ref_language::apm::lang_list_for_5_6_0d2        
ref_language::set_data       Add new ISO-639 language codes (3 chars and 2 chars) where they don't exist, update them otherwise. 
ref_language::set_iso1       Add a new ISO-639-1 language code (2 chars) if it doesn't exist, update it otherwise