bug 33147; mdash and ndash were both transliterated to a single '-'; made

the mdash longer by using 2 hyphens "--"; r=none

intl/unicharutil/tables/transliterate.properties

@@ -63,7 +63,7 @@ entity.8226=.
 # EN DASH
 entity.8211=-
 # EM DASH
-entity.8212=-
+entity.8212=--
 # SMALL TILDE
 entity.732=~
 # TRADE MARK SIGN