Revert "Removed f-strings for backward compatibility in python versions."
Revert "Removed f-strings for backward compatibility in python versions."

This reverts commit 94ccf74fae9ce2de0c19ca83bd634f7c292245dc.

crawln45/Flexget,crawln45/Flexget,Flexget/Flexget,malkavi/Flexget,ianstalk/Flexget,ianstalk/Flexget,ianstalk/Flexget,Flexget/Flexget,Flexget/Flexget,malkavi/Flexget,malkavi/Flexget,malkavi/Flexget,Flexget/Flexget,crawln45/Flexget,crawln45/Flexget