debian: Add Dutch translation of debconf messages

Closes: #906945

Thanks to Frans Spiesschaert for the patch.
Signed-off-by: James Valleroy <jvalleroy@mailbox.org>

debian/po/nl.po

+# Dutch translation of plinth debconf templates.
+# Copyright (C) YEAR THE PACKAGE'S COPYRIGHT HOLDER
+# This file is distributed under the same license as the plinth package.
+# FIRST AUTHOR <EMAIL@ADDRESS>, YEAR.
+# Frans Spiesschaert <Frans.Spiesschaert@yucom.be>, 2018.
+#
+msgid ""
+msgstr ""
+"Project-Id-Version: plinth_0.34.0\n"
+"Report-Msgid-Bugs-To: plinth@packages.debian.org\n"
+"POT-Creation-Date: 2018-07-03 16:39+0530\n"
+"PO-Revision-Date: 2018-07-31 16:32+0200\n"
+"Last-Translator: Frans Spiesschaert <Frans.Spiesschaert@yucom.be>\n"
+"Language-Team: Debian Dutch l10n Team <debian-l10n-dutch@lists.debian.org>\n"
+"Language: nl\n"
+"MIME-Version: 1.0\n"
+"Content-Type: text/plain; charset=UTF-8\n"
+"Content-Transfer-Encoding: 8bit\n"
+"Plural-Forms: nplurals=2; plural=(n != 1);\n"
+"X-Generator: Gtranslator 2.91.7\n"
+
+#. Type: note
+#. Description
+#: ../templates:1001
+msgid "FreedomBox first wizard secret - ${secret}"
+msgstr "Geheime code voor de initiële wizard van FreedomBox - ${secret}"
+
+#. Type: note
+#. Description
+#: ../templates:1001
+msgid ""
+"Please save this string. You will be asked to enter this in the first screen "
+"after you launch the FreedomBox interface. In case you lose it, you can find "
+"it in the file /var/lib/plinth/firstboot-wizard-secret."
+msgstr ""
+"Bewaar deze tekenreeks. Er zal u gevraagd worden om ze in te voeren in het "
+"openingsscherm bij de eerste opstart van de FreedomBox-interface. In geval u "
+"ze kwijtraakt kunt u ze terugvinden in het bestand /var/lib/plinth/firstboot-"
+"wizard-secret."