Opera 12 extension to add a button with a flag of a country where the sever is located.
Note that this extension is no longer supported or developed
This extension in addons catalog: https://addons.opera.com/extensions/details/flag-button/
Archived page of this extension on myOpera: https://web.archive.org/web/20130316170346/http://my.opera.com/alex-shpak/blog/flag-button