[opencms-dev] What are locales for OC 6.0?

[Dmitry]

Hello all
What is locales for Opencms 6.0? Is it compatible with Opencms 5.0?
Can I use old locales modules? 

I found strange lines in file WEB-INF/config/opencms-system.xml:

               <internationalization>
                        <localehandler
class="org.opencms.i18n.CmsDefaultLocaleHandler"/>
                        <localesconfigured>
                                <locale>en</locale>
                                <locale>de</locale>
                        </localesconfigured>
                        <localesdefault>
                                <locale>en</locale>
                                <locale>de</locale>
                        </localesdefault>
                </internationalization>

I don`t seen like lines early.

Any point ??
Thanks.