Please enable the Extension:SandboxLink on the Dutch Wikiquote (nlwikiquote), identical to the one installed on the Dutch Wikipedia (nlwiki).
Otherwise we install it as (default) gadget, but that seems not to be the preference.
Thanks!
Local project discussion: https://nl.wikiquote.org/wiki/Overleg_gebruiker:Romaine#Zandbak.2FKladblok_in_user_menu