Bug 12502: (follow-up) Use modal to add/edit order notes

Bug 12502: (follow-up) Use modal to add/edit order notes

Replace inputs to edit notes by a link opening a modal, similar
to the basket summary page. This makes it possible for the notes
to appear in the datatable exports.

Also fix exporting with the export as csv button at the bottom
of the page to export notes.

Test plan :
1) In the late orders table (acqui/lateorders.pl), a link should
appear in both the internal and vendor note column, following the
current value if it exist.
    -> This link should read "Add ..." if there is no existing note
    or "Edit ..." if there is.
2) Click on the link. A modal should appear. Confirm that saving a
note works as expected.
3) Try exporting to any format using either the button at the top
of the table or the one at the bottom of the page.
    -> The three new columns and their values should appear in the
    export.

Signed-off-by: Séverine QUEUNE <severine.queune@bulac.fr>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>