Difference between English GB and English USA is spelling and terminology.

Put both in a spreadsheet, side by side, and you will see.

I thought so, but I mean is there something in the character encoding on both strings, what makes the difference. When I import a single .txt file with Cyrillic characters in both strings, I can read the words in Lng_American and they appear properly, but in Lng_English I can't (there is strange symbols), like in the pictures above. When import cyrillic words in the others strings there is the same result, only Lng_American is special. I moded the font modules in order to have cyrillic characters in navboot and everything works fine and I have fully functional Bulgarian menu on my navigation. I just wondered why Cyrillic characters are readable in Lng_American, but in others Lng_... not?