fix import sources for all chapter wikis

fix where broken and standardize everyone on the new scheme

related to Bug 31042

now probably coincidentally working (but maybe not for some sister projects):
  co, et, fi, mk, no, se, tr
  (country code and lang code are the same or some other, unrelated lang
  happens to exist to at least make it not NXDOMAIN)

  * co had e:en, not sure what that was supposed to be, removed for now

probably broken:
  mx, ru

  * mx is not a lang, can't use one-letter prefixes (bug 7496)
  * ru was using 'r' instead of ru?

already was going through meta as the first hop:
  nyc

fixed in previous changeset (I29941e17f7851c5a93):
  br (Bug 58936)

Change-Id: I2180ce9ff6901174c5cf3f5ca9d33eceaa930c09