Translated countries names are sanitized twice

Currently, the formatters provided by the Countries I18n module are calling check_plain() on a string that's been sanitized already by I18N itself.
countries_i18n_translate() is calling i18n_string() ... and in the end the format_translation() method of the i18n_string object

This method adds some defaults settings to the options array $langcode, 'sanitize' => TRUE, 'cache' => FALSE, 'debug' => $this->textgroup()->debug);

Patch to come.