How to edit the text on the wiki tabs

I would like to change the text on one of the wiki tabs. Specifically, I would like to use the "discuss" tab as a way to "suggest an edit". Since the comments (discussions) would be moderated, it would be a good way to get people to suggest content changes for a page since I have yet to find a good way to limit spam additions to the pages.

I have tried to edit the language file in the wiki languages folder using poedit, but it does not seem to make the changes wehn I upload the two files. Any suggestions?