Thanks to many people who have helped with this effort!
This query shows a list of regions that have the new default_language tag
(you can multisort column with shift or control clicking the headers).
This query has also been added to the key:default_language wiki page at the
P.S. same query, but with the last editing user included:
On Tue, May 8, 2018 at 12:02 AM Yuri Astrakhan <yuriastrak...@gmail.com>
> Hi, most countries now have a default_language  tag, specifying the
> most likely language of the "name" tag in that region. Here's a list of
> 60+ countries that have multiple official languages. If you have local
> knowledge, or can research it, could you add the proper default_language
> tag to these relations? Also, if most of the country uses one language,
> but some region uses a different default language, please set first
> language on the whole country, and the second language on the smaller admin
> region. Do not set multiple languages, e.g. "en;fr". See
> Key:default_language wiki page.
> This query generates a list of admin boundary relations that have no
> default_language tag. It also shows country's the official languages per
> Wikidata. http://tinyurl.com/y9382ewv
> Wiki page:
>  https://wiki.openstreetmap.org/wiki/Key:default_language
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