I've tried very hard to do this but I am giving up now. I first tried to localize some wordings of my theme (Function by woothemes)via the Codestyling Localization plugin (great one BTW) and no problem whatsoever, everythings looks good in both Spanish and Catalan.
I cant change the wording of the "Submit comment" blue box here, though:
I went as far as to upload the whole ca_ES.po ca_ES.mo official translations via FTP but it doesn't work. I don't know what's wrong. Anybody help, please?