Screen Writer Studio will handle most alphabets as is. The program is in English but you can write scripts in most languages.
When Screen Writer Studio starts up, it determines the default character set and code page. It also marks any scripts you edit as using that character set and code page. You can override this in advanced options.
For performance reasons Screen Writer Studio uses a single character set and code page on all scripts. You can exit Screen Writer Studio and re-start it with a different locale. But you cannot have two scripts open at once using different character sets and code pages.
Note: Screen Writer Studio will handle DBCS character sets such as Japanese, Chinese, and Korean. It will not handle RTL character sets such as Hebrew and Arabic (it will work but it will go LTR). Nor will it handle complex character sets such as Hindu and Thai.