From Facebook Developer Wiki

Can i add action on Ignore button in Fb:req-choice tag.

Is it possible to use <fb:intl> tags in the label of a fb:req-choice?? (If not, why???)

Sure. Just use fb:fbml-attribute to make any FBML attribute translatable. -- Pete (563683308 11:03, 8 January 2009 (PST))

It would be nice if we could wrap our buttons up in some minimal layout DIV or SPAN tags to make them look halfway decent... Obviously the "ignore" button has to be impervious to CSS tricks to hide it, but surely we should be allowed to style our own request decently...