Is your OS in Spanish or you use Spanish proxy? There is a Region option selection on the top of the page. Notice that it is your coutry or not.
MSDN Community Support | Feedback to us
Develop and promote your apps in Windows Store
Please remember to mark the replies as answers if they help and unmark them if they provide no help.
The language of the Marketplace is being decided by the locale of your Microsoft Account (or Live ID).
If you are registered as Spain user in Microsoft Account, you receive your Marketplace page in Spanish after log in.
Microsoft is conducting an online survey to understand your opinion of the Msdn Web site. If you choose to participate, the online survey will be presented to you when you leave the Msdn Web site.
Would you like to participate?