fix truncated "file conflict" error message in russian 
(http://qa.mandriva.com/show_bug.cgi?id=31680)
nb: the utf8 russian string is 124 chars, whereas the i18n'ed should be <100bytes

the patch uses asprintf. I'm not sure what compatibility is needed.

a simpler patch not using asprintf is to raise the constant 100 to 200
(or 300, who knows...)