Default encryption password? Problem with upgrade to Lollipop

[shade33]

I finally upgraded my Samsung S4 to Lollipop, rebooted, and of course it is no longer accepting my encryption password. I understand it might have reset itself to a default password? What might this password be? There's a catch, of course: my version is Spanish, so I need the default Spanish password.

If I can't find a password, what are my options? I have most of the data backed up, but I stupidly have a couple important files that are not backed up, so I would prefer not to lose my data.