Fixed message of FormatEncodeError raised by FormattableString
Fixed message of FormatEncodeError raised by FormattableString

RazerM/logbook,omergertel/logbook,alonho/logbook,FintanH/logbook,DasIch/logbook,alonho/logbook,pombredanne/logbook,DasIch/logbook,omergertel/logbook,mitsuhiko/logbook,fayazkhan/logbook,DasIch/logbook,alonho/logbook,Rafiot/logbook,dommert/logbook,fayazkhan/logbook,omergertel/logbook,Rafiot/logbook,Rafiot/logbook