With Windows 10, version 1803, we started to deliver language translation improvements via Local Experience Packs, also referred to as LXPs. Local Experience Packs are AppX packages delivered via the...
I think you are not understanding the behavior that we are seeing. We already got that ISO and I cannot find LXP for the languages mentioned (en-gb; es-es; el-gr). I already installed the lp.cabs but I can't see that options available on the UI Settings app - Time & Language - Language.
I don't know if you already tried to replicate the issue but the I think you are not following the same steps. This issue is not happehing only in our organization. I have seen some comments reporting the same. Probably we are missing something but there is no information about the steps which makes everything hard.
Please find the screenshots attached where you can see the lp installed and the only option available on the settings UI is English (United States).