I tried your tool - at first look it seemed good to edit files. However it seems to have several bugs:
-If the file language_english.xml is missing from the directory where NopCommerceTranslator.exe resides the program crashes
-If I browse to another file, it reads the first xml block correctly but all other settings are from the originally read language_english.xml . It then saves the file automatically, overriding all my previous settings.
The only way I could get it to work correctly is to always rename your xml file language_english.xml and to place it in the same dir as the .exe - The browse causes problems by overwriting files with what is currenlty in memory.