Takes any vector of languages and returns affiliation.
Examples
aff.lang('Korean')
#> Korean
#> "Koreanic"
aff.lang(c('Korean', 'Polish'))
#> Korean
#> "Koreanic"
#> Polish
#> "Indo-European, Classical Indo-European, Balto-Slavic, Slavic, West Slavic, Lechitic, Polish-Silesian"