If to translate independently into other language, it is simple to locate the 
lang file in the folder with the program. 

The file name shall match a locale of the user in OS. 

The locale is visible at start in the log.txt file of the program, for example

 UserLanguage =Russian

After program start in its folder there are 2 files. 

Current.lang is keys which are now displayed in the program. 
Default.lang is keys in Russian.

After an output of the new version of the program it is necessary to compare English
lang  of the new version to prior version to learn what keys changed both to translate 
them again and to translate new keys. 

After start of the program it is possible to check not translated keys having 
looked at the current.lang file

To start the progran in english rename your locale english (ex. italian.lang) as .old 
(italian.lang -> italian.lang.old) and restart MTKdroid. It will start in english.