[core] Fix Pickers pl-PL
translation after cherry-pick from master
#15183
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Follow-up on #15177
The cherry-pick unintentionally had a couple of changes that break this translation.
https://github.com/mui/mui-x/pull/15177/files#diff-47123d13580721e9d46a57634e5160492a9b30970bb1b01fbc2d06aec81e135fR62-R65