How to change text depending on the country

There are several plugins out there that help you to translate your site content. Though you could have googled that by yourself easily, look here to get a brief overview:
https://premium.wpmudev.org/blog/top-6-translation-plugins-for-your-wordpress-site/

WPML is a very powerful translation plugin (not free), in your case qTranslate should be good enough and is easier to implement than WPML I guess.

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