The deal of the set development :
– use the standard tables (no new tables added),
– use the functions of the WordPress core (only add short specific function),
– shortest script for fastest performance,
– few modifications in theme (only to detect current language of webpage or post or list of posts),
– online transformation (style, text) of the theme according of rules associated to the language of posts,
– full separation between the language of current wp (admin part) and content parts (post, page, theme).
xiligroup dev team