SitecoreContentSearch.Facets.cs

using (var context = ContentSearchManager.GetIndex("sitecore_master_index").CreateSearchContext())
{
  var facets = new FacetResults();

  facets = context.GetQueryable<SearchResultItem>()                        
                  .FacetOn(x => x.Language)
                  .GetFacets();

  foreach (var facetCategories in facets.Categories)
  {
    foreach (var facet in facetCategories.Values)
    {
      // The name of the language, i.e. EN, UK or DK
      var facetName = facet.Name;                     
      // The total amount of items for given language
      var facetAggregateCount = facet.AggregateCount; 
    }
  }
}