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
Remove unused language strings in com_weblinks
Fix small issue with mod_menu (backend)
Remove unused language strings in com_contact
 $ [#31944] Standardise on select not check. Thanks Brian Teeman
(Fix #1927)
 # [#31840] Can not set class to calendar input. Thanks Achal Aggarwal
 # [#31929] mod_footer : year do not convert to other calendar like
persian language that use hijri date. Thanks Mohammad Hasani Eghtedar
and Carsten Wirtz
(Fix #1905)
 # [#31913] Search results in Template Manager contain more than just
templates. Thanks Elin Waring
(Fix #1893)
 # [#31854] The Module "All Modules" is lost at testing sample data
(mysql). Thanks Tobias Zulauf
(Fix #1829)
[#31965] Fatal error: Call to undefined method UsersModelUser::loadLanguage() (Fix #1950)
[#31948] Beez3: twofactorauth (secretkey field) (Fix #1932)
[#31949] Hathor: twofactorauth (secretkey field) (Fix #1933)
 # [#31848] Archive Articles View frontend
 + Adding Albanian flag
 + Adding Macedonian tinymce lang file. Thnkas strumjan
Correcting Notice [#31840]
Fix system tests for language changes.
Fix problem with select fields not in view.
[#31753] PGSQL Missing #__ prefix on CONSTRAINT "uc_ItemnameTagid" in installation/sql/postgresql/joomla.sql.
[#31894] Check for context in vote plugin