Support tag language

examples/matroskareader.cpp

@@ -44,6 +44,8 @@ int main(int argc, char *argv[])
     PRINT_PRETTY("Target Type Value",
       targetTypeValue == 0 ? "None" : TagLib::Utils::formatString("%i", targetTypeValue).toCString(false)
     );
+    const TagLib::String &language = t->language();
+    PRINT_PRETTY("Language", !language.isEmpty() ? language.toCString(false) : "Not set");
 
     printf("\n");
   }