A:
Hello there,
Yes, Windows 8.1 RT and Office RT can be configured to operate in Spanish with no additional software needed. For more information on Windows 8.1 RT language packs, please visit: http://support.microsoft.com/kb/2607607
For more information on changing the language settings on Office 2013 RT, please visit: http://answers.microsoft.com/en-us/surface/forum/surfwinrt-surfusing/how-can-i-change-the-language-of-ms-office-in/9b16e225-bc0b-4f61-a6b4-1a065165a424
I hope this was helpful to you.