[i18n] Dutch (nl) translations for H5

[Arjen de Korte]

The updated H5 translations for

- horde
- imp
- kronolith
- mnemo
- turba

are available for download from

   http://pub.de-korte.org/H5_Dutch_Translation.tgz

Time permitting I will try to finish the updated translations tomorrow for

- ingo
- nag
- timeobjects

Best regards, Arjen