use iso 639-3 for languages

[segler-alex]

FROM MAIL:

Hello,

I feel great to be able to find radios on this site. However, the category “by language” is a bit messy. Do you think it's good to change the language names to the ones used by ISO 639-3?

In addition, in the category “by country” also exists duplication.

Do you need help? I am not a programmer, but I know about these stuffs of countries and languages.

[GrimPixel]

https://iso639-3.sil.org/code_tables/639/data

Something to notice:

ISO 639-3 introduced “macrolanguage”, which is a collection of several languages (or dialects, according to different stardards) but can be reguarded as one language, such as Arabic, Chinese and Serbo-Croatian. In the ideal situation, no radio has a macrolanguage tag, but for now, macrolanguage tags are hard be avoided.

A few radios are in multiple languages. There is a “Multiple Languages” code in ISO 639-3: “mul”, but it would be better to specify in which languages it is broadcast.

Also, there are different names for a language. You can find their alternative names here: https://www.scriptsource.org/cms/scripts/page.php?item_id=language_overview