add: Google's Droid Sans Fallback as custom font.
This may solve problem that some users under Windows XP, get trouble displaying room name in roomlist.
However, this also leads to a larger exe size. Especially, if you failed to compile qrc file, then we have to move font file out of exe.

Signed-off-by: liuyanghejerry <liuyanghejerry@126.com>
update: translations.

Signed-off-by: liuyanghejerry <liuyanghejerry@126.com>
Merge branch 'dev' into new_font
Merge branch '0.4' into new_font
Merge branch '0.4' into new_font
update: bump minor version;
update: updater IP.
Merge branch 'new_font' into 0.4