LPS-43148 Logo Editor still generates FileExtensionException, even if the user uploads a file with an extension allowed
LPS-43148 Update logo_editor.js #3 - image preview
LPS-43148 Always clear the current render parameter pool for the image_uploader (195) portlet

Without this, there would be duplicated parameters ("cmd", "struts_action", "tempImageFileName" etc.) in the resourceURL (= "previewURL") upon closing (hiding) & reopening the Logo Editor view after a successfull tempImage upload
LPS-43148 Do not cache Logo Editor window
LPS-43148 Fix misspell in lang message
LPS-43148 Source formatting