Translated some strings in /i18n/el_GR/main.php.
Translated some strings in /i18n/el_GR/main.php.

bright-sparks/phpfreechat,jahanzaibbahadur/phpfreechat,jahanzaibbahadur/phpfreechat,MingJen/phpfreechat,kerphi/phpfreechat,jahanzaibbahadur/phpfreechat,bright-sparks/phpfreechat,bright-sparks/phpfreechat,MingJen/phpfreechat,kerphi/phpfreechat,MingJen/phpfreechat