Problems with Close Button and text Language

Heya guys,

using the slide in plugin, which is awesome on http://www.on-lijn.nl/asvero @ the homepage.

Only problem is the Close button isnt showing in the middle properly and the text is in english which should be in dutch for me, since this site is a dutch-only site.

Same goes for the Mailchimp Submit button, i would like that in dutch too.

Any pointers of how to fix this would be much appriciated.

Kind regards,

Laurens Hoogland