private bool RegionalDialectsFilter(LanguageInfo li)
{
if (IncludeRegionalDialects)
{
return(true);
}
// always include Chinese languages with region codes
if (li.LanguageTag.IsOneOf("zh-CN", "zh-TW"))
{
return(true);
}
return(string.IsNullOrEmpty(IetfLanguageTag.GetRegionPart(li.LanguageTag)));
}