code: async function(locale) {
        var t = this;
        var cldr = this.__cldrs[locale];
        if (cldr) {
          return cldr; 
        }
        return qx.tool.compiler.app.Cldr.loadCLDR(locale)
          .then(cldr => t.__cldrs[locale] = cldr);
      }
docs: Returns the CLDR data for a given locale
  @param locale {String} the locale string
  @returns Promise({cldr})