In Spanish (but not Portuguese!) letters lose their accent in uppercase. Eg
Opinión => OPINION
Opinión => OPINION
http://www.rae.es/consultas/tilde-en-las-mayusculas (link in Spanish).
Personally (I'm a nobody that doesn't always agree with the Academy) I don't like omitting the accents at all in any circumstances.
étude -> Étude français -> FRANÇAIS