pv-locale-gen: Show a warning if we generated any locales
At the moment, SteamLinuxRuntime users don't get a hint if they are missing required locales at OS level (root cause of https://github.com/ValveSoftware/steam-runtime/issues/541). It seems like it would be better to show a warning, so that at least technical users can see what has happened.
I don't plan to try to wire this up to the Steam GUI, since only technical users will know how to solve this anyway...
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locale-gen: Produce less repetitive output
If we have detected a particular locale as missing, we only need to generate it once. This makes the script output a lot less repetitive, and speeds it up by about 30%.
Fixes: e69ce85e "locale-gen: Add --output-dir option"
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pv-locale-gen: Don't check additional locales if we already failed
If we already know that we need to generate at least one locale, then testing more is a waste of time.
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pv-locale-gen: Give a better hint about where we found locales
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pv-adverb: Let missing locales show on stderr
This will give users a hint about how they can speed up container setup.
Helps: https://github.com/ValveSoftware/steam-runtime/issues/541