Unicode characters break snap

[Gareth France]

Having finally packaged my Roku and Now TV remote (RokuTerm) I am now 
bug fixing and adding polish. It functions very well but is rather ugly 
so I have created a new keypad screen using unicode characters.

It is all written in python and runs perfectly locally, however when 
snapped it fails with the following error:

UnicodeEncodeError: 'ascii' codec can't encode characters in position 
0-24: ordinal not in range(128)

So is there something I have to add to the python script, or the 
snapcraft.yaml to allow the unicode characters?


Thanks

Gareth