Spanish translation

[dani-sanchez-dorado]

Good Redmine Plugin!

I have integrated it in my redmine system, and I have created the spanish translation. Here you have my little contribution to the project:

`

# Spanish strings go here for Rails i18n es: supported_languages: Lenguajes soportados en esta versión highlighting_theme: Esquema de colores usado try_it_link: "Prueba este tema con una demo online:" code_theme: Esquema de colores code_theme_title: Cambiar el esquema de colores allow_redefine: Permitir cambios de esquema de colores por usuario

`

Thanks!