My custom theme does not load the translations

  1. Change your translate file name to el_GR.po and el_GR.mo:

    el_GR.po in: testTheme\languages\el.po
el_GR.mo in: testTheme\languages\el.mo

  2. In 404.php file for print text you should write code like this (add textdomain):

    <?php _e('The requested page does not exist.', 'testTheme'); ?>

Second parameter is textdomain.

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