Added 'nl' to l10n-spec's list of languages and updated l10n-track.

git-svn-id: http://svn.gna.org/svn/wesnoth/trunk@56197 75b3775d-3801-0410-9e12-e2e43121521d
Ran umcpropfix.

git-svn-id: http://svn.gna.org/svn/wesnoth/trunk@56198 75b3775d-3801-0410-9e12-e2e43121521d