First duplicate an option in VZoptioncore's Plugin Setting, set the Symbol as 'language', in JS: draw option just hard code the display text of your available languages, then write a for loop to display the language options.(see image 1). The value from this.getConfigValue(symbol) will return the symbol(something like 'en'/'jp') of your current selected language. I will suggest you set your symbol of languages to number start from 0 in Localization's Plugin Setting(see 2nd image) because in other function like Press OK/Cursor Right/Left will operate them as integer.
