New language + error in es

[ManuSbd]

Hey!

I write a new language for this nice pluggin.

Its catalan maybe not a lot of people need it but.. it's something (rename it to ca.js)
ca.txt

Also i see an error into es.js language

this

badUKVatAnswer: 'No número VAT proporcionado no es válido para el Reino Unido',

should be

badUKVatAnswer: 'El número VAT proporcionado no es válido para el Reino Unido',

Cheers!

[victorjonsson]

Thanx!