I've checked the Dutch language and saw it is translated by a Dutch speaking person from Belgium.
So I was working at the real Dutch version.
But I can not activate the nl-NL.com_hikashop.ini file.
The other file: nl-NL.com_hikashop.sys.ini works fine in the backend Components menu.
So I activated the bug-tracker in Joomla.
I received this error-line at the bottom of the bug-report:
# /var/www/vhosts/my-website-url.nl/httpdocs/00-joomla/libraries/joomla/application/component/view.php
LAST_7_CUSTOMERS="7 CUSTOMERS"
LAST_7_ORDERS="7 ORDERS"
SALES_OVER_THE_LAST_30_DAYS="OVER THE LAST 30 DAYS"
Strange point is: I can't find these line. Not in the English and not in the Dutch languagesfiles.
Who can tell me more about this?