With the recent push from Microsoft adding localisation and variation to the different English dialects, I thought it would be appropriate to create a English GB localisation for Paint.NET!
British English is used in:
United Kingdom (obviously)
Download here: https://yadi.sk/d/4u7xhz20wfcL9w
download the resource file, locate your Paint.NET install, usually located in C:/Program Files/paint.net
and drop the resource file in there. Start up the program, click settings and it should be labeled English (United Kingdom)
(Not sure how to get a proper name for it, couldn't find a tag for it.) thank you Null54!