Typo

Exception Typo

http://forums.osclass.org/development/unknow-cache/
blocked admin if osclass.org is down and updates wasn't checked for a while
moved to background checking updates of plugins , themes and languages
Merge pull request #1780 from dev-101/patch-13

Typo
Merge pull request #1781 from conejoninja/blockadmin

Blockadmin
change version to 3.5.3
Merge branch '353' into hotfixes