Welsh translations

Added Welsh translation file and added a supporting example page and a token test in cySpec

A couple of issues:
* The translation implementation means logic has been duplicated, does the interpolation logic belong in that file or should it be pulled out into it's own module?
* Did you look at using requirejs i18n bundle to manage translation loading?  http://requirejs.org/docs/api.html#i18n would allow consumers to set the locale in requirejs config, overrides could be allowed by just passing in a dictionary containing the overrides.
* The "show more results" link is not localised