Pontoon: Update Dutch (nl) localization of Firefox Send

Localization authors:
- Mark Heijl <markh@babelzilla.org>

public/locales/nl/send.ftl

@@ -78,6 +78,8 @@ fileCount =
     }
 # size is a localized number followed by a unit of bytes, ex. 2.5GB
 totalSize = Totale grootte: { $size }
+copyLinkButton = Koppeling kopiëren
+downloadTitle = Bestanden downloaden
 expiredTitle = Deze koppeling is verlopen.
 uploadButton = Uploaden
 emailPlaceholder = Voer uw e-mailadres in
@@ -85,3 +87,4 @@ signInButton = Aanmelden/Registreren
 accountBenefitTitle = Maak een { -firefox }-account of meld u aan
 signOut = Afmelden
 okButton = OK
+downloadingTitle = Downloaden