Bug 12111: Improving templates regarding order notes

Bug 12111: Improving templates regarding order notes

This bug changes some lines in modordernotes.tt to make them more easily
translatable, especially in german (remark by K. Fisher on bug 9416).
No change should be visible

It also suppresses the ability to edit order "vendor note" in reception,
as the note for vendor is not made to be changed after the document is
received.

Test plan :
- in a basket, try to edit the notes (internal and vendor) of order.
  Check the display is correct
- go in reception module (parcel.pl page) : in the list of all orders
  to receive, you should have a link to change "internal note", but no
  more link to change "vendor note"
- try to receive a specific order which have a "vendor note". On the
  right panel of the page, you must have an editable textarea for
  internal note, and a non-editable (colored in grey) textarea for
  vendor note

Signed-off-by: Katrin Fischer <Katrin.Fischer.83@web.de>
Signed-off-by: Galen Charlton <gmc@esilibrary.com>