Takes any vector of Glotocodes and returns ISO code.
Examples
iso.gltc('adyg1241')
#> adyg1241
#> "ady"
iso.gltc(c('adyg1241', 'udii1243'))
#> adyg1241 udii1243
#> "ady" "udi"
Takes any vector of Glotocodes and returns ISO code.
iso.gltc('adyg1241')
#> adyg1241
#> "ady"
iso.gltc(c('adyg1241', 'udii1243'))
#> adyg1241 udii1243
#> "ady" "udi"