Problem
When you invoke the installer, it shows a list of ~100 languages to pick from. When you pick, the translation file is downloaded, and you go over to profile selection page. If you decide to go back in your browser and select a different language, it is not anymore possible. When local files are found, only those are listed in the dropdown.
Although this sounds like an obscure use-case I ran into it multiple times in testing the installer, and I think it is confusing.
Proposal
IMHO we should still display all the languages and make it a distro level setting (#1351352: Add distribution level settings to install profiles) if the language offering should be limited to local files only. If there is already a local file, we can/should skip downloading the file from remote as well. Also something to discuss.