Welcome to the forum, and sorry for the late response.
Firangi (can be spelled in different ways) has a straight European blade, usually longer than most Indian swords. See the picture.
Kirach has an Indian, one edged blade, usually with a false edge. The special thing with the Kirach is, that the blade close to the tip curves towards the edge. For a picture, have a look at the link.
http://www.vikingsword.com/vb/showthread.php?t=683&highlight=Kirach