Update index.html

Fixes GH-179.

index.html

@@ -210,7 +210,7 @@ <h4><a href="#h_persian_language">Persian Language</a>
 
 
         <p><dfn>Persian</dfn>—a.k.a. Modern Persian—is the standardized and literary variety of the
-        official languages used in Iran and Afghanistan. The dialect of Persian is Iran is also
+        official languages used in Iran and Afghanistan. The dialect of Persian in Iran is also
         called Western Persian, and is locally known as <span class="qterm">Farsi</span>. The
         dialect of Persian in Afghanistan is also known as Eastern Persian, and is locally known as
         Dari.</p>