Inconsistency between spanish and english version

[GonzaloRizzo]

• When you are in the English version of the page the header of the first story is 'hi pyschool', but on the Spanish version, it says 'hi python'
• If you are on the English version and you click on 'Spanish' it redirects you to index.es.html but on the Spanish version if you click on 'Español' it takes you to es.html, which doesn't exist
• The Spanish version of the page doesn't have the Learn Regex story