* Julien Palard firstname.lastname@example.org, 2017-03-29, 07:47:
It's redundant to display both language and country code if they're the same, for example: "de-DE" or "fr-FR".
This wording is unfortunate. It seems to imply that you can meaningfully compare a language code and a territory code for equality. This is not the case. For example, Belarusian (language code "be") is mainly spoken in Belarus (country code "by"), not in Belgium (country code "be").
Thanks for noticing, would the intented meaning is "when they add no distinguishing information", is it better like:
====== We may drop the region subtag when it does does not add distinguishing information, for example: "de-DE" or "fr-FR". (Although it might make sense, respectively meaning "German as spoken in Germany" and "French as spoken in France"). But when the region subtag actually adds information, for example "pt-BR" for "Portuguese as spoken in Brazil", it should be kept. ======
Bests, -- Julien Palard https://mdk.fr