Fix the Bulgarian translation's codeset.

The codeset of the Bulgarian translation was incorrectly specified as
ISO-8859-1 instead of CP1251.  This led to incorrect transcoding to
UTF-8 and the display of wrong characters in the Fluxbox menu.
make sure that result of division is signed int

there is problem that x/y ended with unsigned int value due to
width()/height() and negative result of division ended up being big
it causes Focus to move window due to screen boundary checks

fixes annoying behaviour of window moving few pixels with
Mod4 KP_8 :MacroCmd {ResizeTo 100% 50%} {MoveTo 0 0 Top} {Raise} {Focus}