acceptsLanguages (...args) {
    return this.accept.languages(...args)
  }
Return accepted languages or best fit based on `langs`.

Given `Accept-Language: en;q=0.8, es, pt`
an array sorted by quality is returned:

    ['es', 'pt', 'en']

@param {String|Array} lang(s)...
@return {Array|String}
@api public