https://bugs.winehq.org/show_bug.cgi?id=57440
--- Comment #3 from Fabian Maurer dark.shadow4@web.de --- Not too good with perl, but this seems to be the part that fills it:
my @sshortdate = loc_query( $loc, "/ldml/dates/calendars/calendar[@type='gregorian']/dateTimeFormats/availableFormats/dateFormatItem[@id='yMd' and not(@alt)]" ); push @sshortdate, loc_query( $loc, "/ldml/dates/calendars/calendar[@type='gregorian']/dateTimeFormats/availableFormats/dateFormatItem[@id='yMMMd' and not(@alt)]" );
Not sure why it doesn't use
<dateFormatLength type="short"> <dateFormat> <pattern>dd.MM.yy</pattern> </dateFormat> </dateFormatLength>