btsync-gui: Crash on non-latin chars in folder name

[tuxpoldo]

Reported by forum user progmachine:

Hi people. After recent btsync update i encountered a problem: btsync-gui crashes when opened.
I have some sync folders named using not latin characters, on my native language. Locale is ru_RU.UTF8
Crash message: "btsync-gui crashed with UnicodeEncodeError in init_folders_values(): 'latin-1' codec can't encode characters in position 18-26: ordinal not in range(256)".
btsync-gui remains active, but not showing non latin folders.
Ubuntu 12.04 amd64