Correct code for letter hamza

git-svn-id: https://plugins.svn.wordpress.org/transliterate-arabic/trunk@802990 b8457f37-d9ea-0310-8a92-e5e31aec5664
Updating changelog

git-svn-id: https://plugins.svn.wordpress.org/transliterate-arabic/trunk@803312 b8457f37-d9ea-0310-8a92-e5e31aec5664