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)
I should've put a comment here, this one is confusing as-is.

The reason for the itemType check actually isn't for Zotero, but to handle a weird quirk in SIRS that only appears on Government Document and Primary Source pages (which both get converted to Zotero type "document"). They have an extra line for an associated agency, like "Department of Justice (DoJ)", which ends up getting parsed as if it's the place. There's no foolproof way to differentiate between actual places and false positives like this except to check against an array of common organizations that might come up, like Department of Justice, the FBI, the White House, using any string variations that might pop up in SIRS. So, it was either to ignore place on itemTypes where this is going to occur (which never seemed to have a real place anyway), or just accept the incorrect result (some string butchering of "Department of Justice (DoJ)") and let the user manually correct it if/when it happens.