Bug 9331 - Untranslatable strings in ajax.js

Bug 9331 - Untranslatable strings in ajax.js

This patch moves untranslatable strings from ajax.js into the template
where they can be picked up by the translation script.

To test that preference-related error messages continue to work,
open the system preferences editor in two tabs. Log out in one tab and
try to save a system preference in the other. You should see correct
error messages.

To test that error strings are now translatable, run "perl translate update
 <lang>" from misc/translator, then check if the affected strings shows
up in the po file.

Signed-off-by: Chris Cormack <chris@bigballofwax.co.nz>
Still works, and is now translatable

Signed-off-by: Jonathan Druart <jonathan.druart@biblibre.com>
Signed-off-by: Jared Camins-Esakov <jcamins@cpbibliography.com>