Login the CMS with Safari 5 and other unsupported browsers should show a warning that the browser version is not supported

The list of supported browsers must be updated to match the latest requirements: ie 8, safari 7, firefox 24, chrome 35

Note that firefox 24 is the extended service release [1]

Current CMS supported versions list:
ie 7 >=
firefox 3 >=
safari 5 >=
chrome 7 >=

[1] http://en.wikipedia.org/wiki/History_of_Firefox#Release_history
[2] http://en.wikipedia.org/wiki/Google_Chrome
[3] http://www.onehippo.org/library/about/system-requirements.html