how to duplicate each row of a mysql table?
You can do it like this:

create new_table as
select name, 'italian' as language, property1_IT as property1 from old_table
union all
select name, 'english' as language, property1_EN as property1 from old_table
union all
select name, 'french' as language, property1_FR as property1 from old_table;