Bug 28840: Better texts in batch record modification/deletion

Bug 28840: Better texts in batch record modification/deletion

Tools batch record modification/deletion form contains texts in legends, labels, hints.

I feel like :
Labels are sometimes too long, showing them on multi-lines, like "Modify record using the following template". Long texts should be in legend or hint.
Legend are sometimes contains redundant text, like in tabs.
Also I propose to use "record id" instead of "record number".

Test plan :
Compare texts in page without and with patch

Signed-off-by: Sally <sally.healey@cheshiresharedservices.gov.uk>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>