Bug 12110: (follow-up) add French and German translation

Bug 12110: (follow-up) add French and German translation

This followup
- translates "vendor note" in French and German.
- replaces "Notes for vendor" with "Note for vendor" in English template
  (as there can only be 1 note)
- fixes a typo in French template (Qte => Qté, for "Quantité")

Test plan :
[1] set OrderPdfFormat preference to "French 3-pages"
[2] Print a basketgroup containing an order with a vendornote, and check
    the note is displayed and introduced by "Notes pour le fournisseur"
[3] set OrderPdfFormat preference to "German 2-pages"
[4] Print a basketgroup containing an order with a vendornote, and check
    the note is displayed and introduced by "Lieferantennotiz"

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>