Add multi-language interface to an AuroraGPT script

looking for a programmar to modify a PTC site i own with a auroragtp script. i would like to add to this site my native language and the site must be working at same time in these 2 languages. so what i want is to have a multi-language interface where users can choose - by clicking in a flag - the prefered language alltought the database etc.. should be together as a single one database.