Dutch language files

Hi everyone,
I have a problem with dutch translated files for voicmail prompts.
Found them here :
http://www.dialxs.com/wpress/?p=429&utm_source=rss&utm_medium=rss&utm_campaign=dialxs-asterisk-page&wpmp_switcher=mobile

Everything works fine except voicemail messages !
When a user has a message in his voicemailbox, he`s unable to listen to it.
The dutch voice asks to press 1 to listen to the new message, but when pressing 1 nothing happens. Whit the original language (english)it works fine !
What am I doing wrong ?