Fix es-AR locale for Tor Browser

gk wrote:

I actually had to remove bn-BD again as there is an XML entity error in browser.xul (1404:3) related to appMenu-iüdate-available-notification. I did not figure out in the little time I had why this only affects bn-BD nor how to route around it. But I removed the locale in commit bff4fd1fe7a4e1f105973e9af217b8fefc3db392 from master in tor-browser-build.

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