We've actually been pretty good at getting this right in most of the
code base, but we've missed it in a few places. Python defaults to the
encoding of the current locale unless otherwise specified, and for a US
English Windows install that's cp1252, not UTF-8. I'm not brave enough
to change the locale at startup because I don't know how that might
affect CJK encoding users (or for that matter, non-Latin derived
alphabet UTF-8 variants).
Fixes https://github.com/dcs-liberation/dcs_liberation/issues/2786.
If the user's DCS directory is not configured correctly this will
degrade by not showing an icon. Otherwise (and typically) we get nicer
looking icons for each theater, and we don't have to make these for each
new map.
