Fixes the multi language support for the debian package.

debian/jitsi-meet.install

 css					/usr/share/jitsi-meet/
 sounds					/usr/share/jitsi-meet/
 fonts					/usr/share/jitsi-meet/
-images					/usr/share/jitsi-meet/
+images					/usr/share/jitsi-meet/
+lang					/usr/share/jitsi-meet/