Update helper.php

Prevents thousands separator (",") from being used when total cache size exceeds 1mb.

http://joomlacode.org/gf/project/joomla/tracker/?action=TrackerItemEdit&tracker_item_id=31826
 # [#31936] Add active class to breadcrumb module for more bootstrap
compatibility. Thanks Michael Babker.
(Fix #1920)
Simplify tooltip
FOF updates: removal of update server and addition of a README.txt file (Fix #1931)
 +$ [#31725] Joomla multilingual site automatic installer. Thanks Carles
Serrats and Javier Gómez
(Fix #1846)
Remove unused language strings in com_weblinks
[#31946] Support new mvc components in com_menus.
Fix changelog. Note that commit message for a1b758db855d2e76a1ccbef2aa07ece980a09f85 should be  [#31930] Ordering Form Field Changes.
Remove unused language strings in com_contact
[#31955] Two factor authentication is broken in the back-end (Fix #1939)
[#31950] Hathor: twofactorauth (user manager) (Fix #1935)
Small typo correction to en-GB.com_ajax.ini
change to the contraction of it is

to keep George happy
Fix up some doc blocks due to phpdoc output missing
Add missing doc blocks or descriptions based on phpDocumentor error report
 # [#31961] *Login Modules wrongly display tips (RTL and LTR)
(Fix #1948)
 $ [#31923] Replace non-existent word multilanguage. Thanks Brian Teeman
(Fix #1901)
monolingual missing
Merge pull request #1947 from brianteeman/patch-15

Small typo correction to en-GB.com_ajax.ini
Merge pull request #1926 from brianteeman/patch-1

Simplify tooltip