Setup Dutch translations and Belgian hollidays

[david]

I've added Dutch translations for days and months. Also Belgian official hollidays in Dutch, French and German.
Attatched the export files for pcworx.
Following types must be changed to ARRAY [1..4]: oscat_MONTHS, oscat_MONTHS3, oscat_WEEKDAYS, oscat_WEEKDAYS2   
oscat_LOCATION_ELEMENTS   : ARRAY [1..7] OF INT;

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