Comment 44 for bug 909328

Made the update in user messages in revision 11363.
I noticed however another tiny issue for user experience: it is still possible that de "replace all" button is active even when no object matches the selection criteria. Actually now, virtually always the replace button is set to sensitive when the find button is. Probably sensitive should set to false at the bottom of onToggleCheck for the replace button, whereas the status should be set to true only in the specific valid cases in onAction. Not sure about the implementation now, need to study this further ...