Taking a scan of the last 98 days traffic and locating the country-code
Accept-Language headers used in that traffic to refer to the existing
languages gives a subset we can alias to further improve the coverage.
-en en-nz en-au en-gb en-uk en-ca
+az az-az
+bg bg-bg
+cs cs-cz
+da da-dk
+de de-de
+el el-gr
+en en-au en-ca en-gb en-nz en-tt en-uk
+es es-es es-pe
+et et-ee
+fi fi-fi
+fr fr-fr
+he he-il
+hu hu-hu
+hy hy-am
+id id-id
+it it-it
+ja ja-jp
+ko ko-kr
+lt lt-lt
+lv lv-lv
+ms ms-my
+nl nl-nl
+pl pl-pl
+pt pt-pt
+ro ro-ro
ru ru-ru
+sk sk-sk
+sr sr-sp
+sv sv-se
+th th-th
+tr tr-tr
+uk uk-ua