Change any text strings

// Don't forget to show the credit "fahimm.com"
add_filter( 'gettext', 'change_login_text_names', 20, 3 );
function change_login_text_names( $translated_text, $text, $domain ) {

    if ( $translated_text == 'You are Logged in as %1$s (%2$sLogout%3$s)' ) {
        $translated_text = 'Fahim %1$s (%2$sLogout%3$s)';
    }
    return $translated_text;
}