Bug 34801: Fix incorrect use of __() in .tt and .inc files (bug 34038 follow-up)

Bug 34801: Fix incorrect use of __() in .tt and .inc files (bug 34038 follow-up)

__() should be used in .js files, not .tt files

To test, apply the patch and update a translation, e.g. fr-FR:

  > cd misc/translator
  > perl translate update fr-FR

- Open the corresponding .po file for JavaScript strings, in this case
  misc/translator/po/fr-FR-staff-prog.po
- Confirm that the strings are now in the .po file for translation. You
  should find the lines in the commit

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Victor Grousset/tuxayo <victor@tuxayo.net>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 3b190d625b378de451dd1ca6d1db636dc5f56741)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>