Author: Dan Poltawski
MDL-44433 lang: Update the name of country code CV
ISO-3166 has updated this name to Cabo Verde:
https://www.iso.org/obp/ui/#iso:code:3166:CV
http://git.moodle.org/gw?p=moodle.git;a=commit;h=70fbd52bfd06348fccdd3bd37cc8f9f3a60a7a96
http://github.com/moodle/moodle/commit/70fbd52bfd06348fccdd3bd37cc8f9f3a60a7a96
+ 2.6 en [CV,core_countries]