Bug 22080: Easier translation of ElasticSearch mappings page

Bug 22080: Easier translation of ElasticSearch mappings page

Actual translation of ElasticSearch mappings page contains a huge block with a lot of %s.
It makes translation hard.

This patch uses new method from Bug 15395 to split into several translation blocks.

Test plan :
1) Apply patch "Bug 22080: [DO NOT PUSH] test code"
2) Apply this patch
3) Enable ElasticSearch in SearchEngine preference
4) Go to Administration > Search engine configuration
5) Check page is OK
6) Update the PO files of a language : perl translate update xx-YY
7) Write translation strings in misc/translator/po/xx-YY-messages.po
8) Install translation : perl translate install xx-YY
9) Check translated page

Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>