Fix on statistic in jsf document's page

https://bugzilla.redhat.com/show_bug.cgi?id=1064737

Changed `StatisticsServiceImpl.getStatistics(String projectSlug, String iterationSlug, String docId, boolean includeWordStats, String[] locales)` to use `StatisticsServiceImpl.getDocStatistics(Long documentId, LocaleId localeId)`