I have removed the reference to Jalan being terraformed, for the following reasons: 1) There is no source referenced in the page for this claim. 2) The textual sources on the CIG website for the system and planet do not mention Jalan being terraformed, as far as I can see. 3) Tevarin can survive in the same conditions as humans, as evidenced by tevarin being widespread in UEE space and a senator elected, yet no mention being made of them requiring life support. 4) The Loremaker's guide video on the Elysium system mentions that 'planets of the former Tevarin empire were colonised and terraformed' after their defeat. This is the only mention I can find of terraforming that *could* apply to Jalan, and it does not explicitly say Jalan was. Notably, it is also said in this video that the Tevarin did not have Terraforming tech, implying there would be plenty of candidates for terraforming, and not that we were terraforming planets that the Tevarin had already terraformed for their needs. 5) In the same video, Elysium III (Vosca) is explicitly described as having been terraformed. It is typical for such mentions to be made for terraformed planets. No mention of this is made for Jalan. 6) The UEE does not seem to terraform planets that are survivable but imperfect: see Microtech, they didn't go back for a second pass despite the cold. While it is conceivable that 'comfortable' for a Tevarin is inhospitable for us, there is no evidence to suggest that.
I would not be comfortable claiming that Jalan definitely *wasn't* terraformed, but I don't think it can be confidently claimed it was. If there is a source for it, I suggest putting it in clearly.