Takes any vector of languages and return links to glottolog pages.
url.lang(x, popup = "")
A character vector of languages (can be written in lower case)
character vector of strings that will appear in pop-up window of the function map.feature
# NOT RUN {
url.lang('Korean')
url.lang(c('Gangou', 'Hachijo', 'Adyghe', 'Ganai'))
# }
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