Version 10.6 is not disabled for languages other than English for the resource documentation (https://enterprise.arcgis.com/en/portal/10.5/administer/windows/portal-deploy.htm).
The help topic has been removed for 10.6.x and later versions in all languages.
As of 10.6.1, Operations Dashboard is part of the portal by default: https://enterprise.arcgis.com/en/portal/10.6/administer/windows/what-s-new-in-portal-for-arcgis.htm#ESRI_SECTION2_264A292BA07F4057B745757AA713F59C