Don’t extract QML strings as Java printf strings

The percentage sign in strings like ‘%1% charging’ couldn’t
be properly translated in the resulting POT file. For example,
translating it to ‘%1 % charging’ (some languages use a space
before the percentage sign) resulted in an invalid Java printf
string (but a valid QML string), which was reject by msgfmt.

(cherry picked from commit 6811816a)
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passed linux kf5-qt5 qt5.15 #99238

00:06:39

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