Want to convert plugin in English written in Other language



Hi everybody mostly the developers. My friend has written the plugin its great to 5 plugin but its in other language i want it to convert that language or the display pop comes its in other language i want that in English. Its in beta version if anybody interested plz. I have to ask for the permission also from the developer still not yet taken. but i have requested him and soon i will get the reply mean time is that possible to convert that language to English