huge fonts in frontend

there was huge size increase for alpha packages recently.
1.7 was 8mb, while 1.7.2 is 19mb.

turns out, it's mostly two font files - kochi-gothic-subst.ttf and kochi-mincho-subst.ttf - they are ~ 17mb uncompressed.

supposedly japanese users use locally installed system fonts anyway, and dejavu contains japanese glyphs for fallback, thus these huge fonts will be removed