Fix fetching of language codes from loc.gov.
Fix fetching of language codes from loc.gov.

Use the CSV-like file from the site rather than the HTML.
The key in save_polygons is a dummy, so label it as such.

Code4SA/mapit,chris48s/mapit,Sinar/mapit,chris48s/mapit,opencorato/mapit,Code4SA/mapit,Sinar/mapit,Code4SA/mapit,opencorato/mapit,opencorato/mapit,chris48s/mapit