Bug 33154: Tab WRAPPER follow-up: label text must be translatable

Bug 33154: Tab WRAPPER follow-up: label text must be translatable

This patch updates templates which have already been updated to use the
new tab WRAPPER system for generating tab markup. Templates are changed
so that tab label strings are wrapped in <span> to make them
translatable.

The html_helpers include file is also updated so that the example code
in comments shows the right pattern (the breadcrumb example is similarly
corrected).

To test apply the patch and run the translation script to update the .po
files, e.g.

perl misc/translator/translate update fr-FR

Check the updated .po files for some of the lines modified in the patch:

 - koha-tmpl/intranet-tmpl/prog/en/modules/about.tt:31
 - koha-tmpl/intranet-tmpl/prog/en/modules/acqui/addorderiso2709.tt:69
 - koha-tmpl/intranet-tmpl/prog/en/modules/acqui/basketgroup.tt:330
 - koha-tmpl/intranet-tmpl/prog/en/modules/acqui/invoices.tt:141
 - koha-tmpl/intranet-tmpl/prog/en/modules/admin/item_circulation_alerts.tt:118
 - koha-tmpl/intranet-tmpl/prog/en/modules/serials/serials-search.tt:259
 - koha-tmpl/intranet-tmpl/prog/en/modules/tools/letter.tt:455
 - koha-tmpl/intranet-tmpl/prog/en/modules/serials/subscription-detail.tt:98

Signed-off-by: Caroline Cyr La Rose <caroline.cyr-la-rose@inlibro.com>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>