The Spanish language files is the latest language release by the international community for ImpressCMS. The base language for ImpressCMS is English and if you would like to customize your ImpressCMS for another language, download one of the language packs.
If your language is not yet available, and you would like to assist with translation, then please download one of the other languages to see which files need changing and begin translating.
All our languages are maintained in the SourceForge SVN, and you can use the Impress Community forums here to ask about creating a new language branch and getting SVN access for commiting a translation.