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Locale is client locale, you can change it in the game's options on the battle.net client and it downloads the selected language if it wasn't already selected; though as far as I know, external modifications may be required to load servers in unsupported languages.
Not sure if NA has any restrictions of the sort, though. I know a lot of people play on NA using Korean or Chinese language or even French, the latter by simply downloading the French language pack for the client, and they seem to be doing fine, but I couldn't load Russian servers on EU unless the client was set to Russian locale.
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