WIKI-686 [IE browsers] Several problems when page title has accent characters

Fix description:
* In IE, wiki page name is not needed to encodeURI beforing sending ajax request
WIKI-686: [IE browsers] Several problems when wiki page name contains accent characters

Fix description:
* Close button in preview must use onclick action
* Watch and Unwatch action have to be invoked by onclick instead of href
* Replace href by onclick
* Invoke ajax function by eval, not window.location
Merge branch 'fix/4.0.x/WIKI-686' into stable/4.0.x