Drop down list with flag and country name or language name to select language

This is a very small project that include developing a drop down list with country flag and country name that allow select language. Then I will integrate it in my website project. I need it with one page that allow testing translation between two languages. Instruction is required for adding more languages. I need three versions of it: a) translation based on file; b) translation based on database; translation based on files and database.