Change page-title Classifieds Plugin

Hello,

I am looking for assistance with the classifieds plugin. I would like to change the page-title of the plugin, so that it affects all related pages (classifieds, add classifieds, edit classifieds etc.,)...

I would also like to be able to implement this on a multi-site install so that site admins can easily change this to fit their specific need. (a shelter site might want it called 'adoptions', or a mechanic might want it called 'parts')

Thank you for your time. I look forward to your response.