CMSPLT 23 : Fix harcoded messages and adapt texts to the last version of CKEditor

Fix hardcoded messages on configureContent.jsp

The "Edit" link depends on fluid project and it doesn't look to be translate
@see https://github.com/fluid-project/infusion/tree/infusion-1.4/src/webapp/components/inlineEdit/

The content area can't be edited by clicking : http://fluidproject.org/releases/1.4/demos/inlineEdit/rich/html/inlineEdit.html