Cannot set Localization

I used scheduler version 4 professional and i set in the document head

<script src="/static/dhtmlx/dhtmlxScheduler/sources/locale/locale_de.js" charset="utf-8" type="text/javascript"></script> <script src="/static/dhtmlx/dhtmlxScheduler/sources/locale/recurring/locale_recurring_de.js" charset="utf-8" type="text/javascript"></script>

but nothing change.

The Demo Page schould be espanol, but ist english too.

http://docs.dhtmlx.com/scheduler/samples/01_initialization_loading/07_locale_usage.html

Its a bug?

I need a suggestion.

Please.

Hello,
locale_[lang].js overwrites an object that holds text of all labels used in the component.
The demo Page currently not shows the correct locale because the required locale file is missing(we’ll fix this in the nearest time).
When you use on the page - make sure the file is loaded and it is done before scheduler.init was called