It looks like the characters are being converted due to the character set not being supported. Please keep in mind that we support 8-bit character sets and the accents in the example you gave appear to have come from a language that uses a 16-bit character set; which is also sometimes referred to as Unicode.
Can you confirm what language and/or character set you are attempting to use?
Regards, Jimmy D. Tier II API Support Engineer
View API documentation, code samples, get your API key.