Language codes versus country codes
First reported by Bart.S: http://portableapps.com/node/18149#comment-113849
"Dear MuseScore developers, please change the czech locale code to 'cs' and use that for your next releases. Thanks! I believe 'cz' is used for license plates only :P"
Upon further investigation
cz is the country code for Czech Republic (ISO 3166) and
cs is the code for Czech language (ISO 631).
I propose we officially adopt IETF language tags
since they are widely used on the Internet by HTML, XML, Wikipedia, etc. An example of IETF language tags is
pt-BR (which we are already using). The first two letters are the language code (Portuguese) followed by the region code (Brazil) if necessary.