Fix Windows cross build

commit 59294029f3d1 ("Capitalize package name and add capitalized tar-ball
prefix") had an unintended side effect: the cross build for Windows on
Linux no longer worked (as it set NAME=subsurface.exe).

Fixed this by introducing a TARGET variable that is derived from $(NAME).

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Fix typo in user visible string

Sadly that means "new translations are needed"

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>
Updates to Norwegian and Dutch translations

Signed-off-by: Dirk Hohndel <dirk@hohndel.org>