[@casiepa Moderator 10 years, 6 months ago]

Hi Marc,
I didn’t try any of them, but these are some possibilities:
1) installing bbPress on the us_US and then downloading the nl_NL bbPress translations and adding them in the bbPress folder (https://codex.bbpress.org/getting-started/bbpress-in-your-language/)
OR
2) Go MU and have the main site in us_US and create a subsite in nl_NL
Pascal.