Bug 28419: Fix addorderiso2709.tt translatability

Bug 28419: Fix addorderiso2709.tt translatability

It seems that the html tag within the TT comment breaks the translate
script

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>
(cherry picked from commit 7efdbccfc2dd79ff6658a60f6381182aff8c84b6)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>
(cherry picked from commit 8bf15c557813efa4278ee07133e7699519ba27fe)
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>