SIRS Knowledge Source [new translator]

New translator for SIRS Knowledge Source, a ProQuest K-12 database
(Note: this only covers Knowledge Source, not SIRS Discoverer or SIRS Decades)
Good catch. I didn't originally write this particular translator; it was for our first iteration of PME a while back, which I took as a starting point. Although I gutted and refactored it, this smaller detail stuck around because it was something that just slipped under my radar.