If we fail to set a UTF-8 locale, the warning claims Qt shall use a
UTF-8 locale, for which it reports an empty string, when in fact it
isn't using a UTF-8 locale, although it'll interact with the system as
if it were.
Also, the user is liable to understand "system locale encoding" as
referring to the underlying system rather than whatever they may have
configured in a local shell; and a non-native speaker assures me the
use of "shall" is also apt to confuse; so reword the messages.
As the old locale is only needed for the code path prints the
warning we can defer resolving it until we know we're going to
use it, by querying the locale at that point.
Done-with: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
Pick-to: 6.5.0 6.5 6.4 6.2
Change-Id: Ie6a6e7a707200e58335fcb64cb1584f0c307895a
Reviewed-by: Tor Arne Vestbø <tor.arne.vestbo@qt.io>
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