Facebook Events and Birthdays calendar

[ajua]

Is there a way we can change the language for the Facebook calendar sync? I have an HTC One M7 and a Nexus 7 both set to sync Facebook events but they appear in English, like John Doe's Birthday but it should be displayed as Cumplea?os de John Doe (in Spanish) as I have both my devices in Spanish. The website is also set to Spanish.

HTC's Calendar and Google Calendar apps are showing the entries in English.

I've been searching the web for a couple of days without any luck. Any ideas or suggestions? Thanks!