I dont' know what is the right method for installing a XML file with Losungen in another languages. The Menu doesn't offer any other Losungen than in German.
So I tried simply to replace the original German XML file ~/.glosung/Losungen Free 2012.xml by the Czech one.
After start, the today Losung is displayed properly – but the glosung crashes after an attempt to moving to the next/previous day using arrows:
Neoprávněný přístup do paměti (SIGSEGV)
On the other hand, moving to the next/previous month works properly.
The same behavior has the command-line losung:
losung ... OK
losung --date=+1 ... crashes with (SIGSEGV)
losung --date=+1m ... OK
'Losungen Free 2012.xml' – in the Czech language