Change Howdy Text

add_filter('gettext', 'l7w_change_howdy', 10, 3);
function l7w_change_howdy($translated, $text, $domain) {
    if (!is_admin() || 'default' != $domain){
        return $translated;
    }
    if (false !== strpos($translated, 'Howdy')){
        return str_replace('Howdy', 'Welcome', $translated);
    }
    return $translated;
}