Add possibility to copy an order

If a supplier has a long list of articles, which are all available, but
the order should contain only a subset of them, selecting them for every
order can take a long time. Starting with a copy of an existing order
can safe a lot of time.

config/locales/de.yml

@@ -1649,6 +1649,7 @@ de:
     actions: Aktionen
     cancel: Abbrechen
     close: Schließen
+    copy: Kopieren
     delete: Löschen
     edit: Bearbeiten
     marks:

config/locales/en.yml

@@ -1658,6 +1658,7 @@ en:
     actions: Actions
     cancel: Cancel
     close: Close
+    copy: Copy
     delete: Delete
     edit: Edit
     marks:

config/locales/fr.yml

@@ -1668,6 +1668,7 @@ fr:
     actions: Actions
     cancel: Annuler
     close: Fermer
+    copy: Copier
     delete: Supprimer
     edit: Modifier
     marks:

config/locales/nl.yml

@@ -1653,6 +1653,7 @@ nl:
     actions: Acties
     cancel: Annuleren
     close: Sluiten
+    copy: Kopiëren
     delete: Verwijder
     edit: Bewerk
     marks: