code: @GET
  	@Produces(MediaType.APPLICATION_JSON)
  	public Response getStatistics(@QueryParam("selectLang") String locale) {
  		List<StatisticRepresentation> listResult = new ArrayList<>();
  		// select "All"
  		if (StringUtils.isBlank(locale)) {
  			List<LocaleRepresentation> availableLocales = localeFinder
  					.findAvailableLocales();
  			for (LocaleRepresentation localeRepresentation : availableLocales) {
  				statisticFinder.findStatisticRepresentation(
  						localeRepresentation, listResult);
  			}
  			
          // select a local
  		} else {
  			LocaleRepresentation localeRepresentation = localeFinder
  					.findAvailableLocale(locale);
  			statisticFinder.findStatisticRepresentation(localeRepresentation,
  					listResult);
  		}
  
  		if (!listResult.isEmpty()) {
  			return Response.ok(listResult).build();
  		}
  		return Response.noContent().build();
  	}
docs: Returns a list contains the result statistic for the selected language
  
  @param locale
  locale selected filter on key name
  @return a list about statistic