Update English version of Dutch organisation names

[bwbroersma]

See

• https://www.forumstandaardisatie.nl/en/netherlands-standardisation-forum
• https://english.ncsc.nl/search?keyword=ncsc-nl&search-submit=

Proposal for content:

s/Dutch Standardisation Forum/Netherlands Standardisation Forum/g
s/Dutch NCSC/NCSC-NL/g