Need global translation of 2 words on wordpress website

I have a website http://adslocker.com. This is a micro job website but I am turning it into an ads marketplace where users can post ad placements that they have on their website and other users can purchase the ad spot. I need the following translated site-wide: Job will be Ad job will be ad Jobs will be Ads jobs will be ads All MUST be case sensitive. I have the .po file, there are just far too many strings for me to do myself, I am sure someone has a technique for doing a global find/replace in the .po. You may use any plugin you like, I would prefer to stick with the .po translation so we can just import the .mo and be good to go, and I can make easy changes in the future, however whatever the easiest way to do this is fine. THE FASTEST WE CAN COMPLETE THIS THE BETTER!