Improve the error message on wrong encoding
Improve the error message on wrong encoding

liblouis/liblouis,liblouis/liblouis,vsmontalvao/liblouis,IndexBraille/liblouis,vsmontalvao/liblouis,vsmontalvao/liblouis,BueVest/liblouis,hammera/liblouis,hammera/liblouis,hammera/liblouis,IndexBraille/liblouis,vsmontalvao/liblouis,hammera/liblouis,hammera/liblouis,liblouis/liblouis,BueVest/liblouis,BueVest/liblouis,hammera/liblouis,BueVest/liblouis,IndexBraille/liblouis,liblouis/liblouis,IndexBraille/liblouis,liblouis/liblouis,BueVest/liblouis,IndexBraille/liblouis,liblouis/liblouis,vsmontalvao/liblouis,BueVest/liblouis