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Google officially changes the Gulf of Mexico to the Gulf of America on Maps
(www.usatoday.com)
This is a most excellent place for technology news and articles.
Interesting discussion about this on the OpenStreetMap forums.
The resolution is introducing "official_name" tags, referencing "en_us", because "en" is not just the U.S.:
https://community.openstreetmap.org/t/gulf-of-america-gulf-of-mexico/124571/11
So when OsmAnd or OrganicMaps start to support them, maybe your locale settings will change the displayed name there as well.
Current description of that node: https://www.openstreetmap.org/node/305639190/history/80
So maybe that could be a reason for everyone around the world to stop using en_US locale settings. XD