Italian translation updated
(cherry picked from commit e8abf89d617e223398dc81d0fe9a2743b7489309)
usermanual: some build system fixes for translated manuals
(cherry picked from commit 28f45224214b3176f9325d7f887e23ba51d9d545)
Updated Dutch translation
(cherry picked from commit 5838d64ab2c76c9e63789881e7f8a887f9ced67e)