func extractMetaLanguage(a *Article, metas *goquery.Selection) {
lang, _ := a.Doc.FindMatcher(htmlTagMatcher).Attr("lang")
if lang == "" {
for _, s := range metaMatcherLangs {
lang, _ = metas.FilterMatcher(s).Attr("content")
if lang != "" {
break
}
}
}
if lang != "" {
a.Meta.Lang = lang[:2]
}
}