Fixing some spelling errors.

application/modules/default/views/scripts/error/error.phtml

-<h1>Unfortunately an unexpected error has occured.</h1>
+<h1>Unfortunately an unexpected error has occurred.</h1>
 <h2>Details have been mailed to the administrator for analysis.</h2>
 <p>
     The error message was: "<?php echo $this->exceptions[0]->getMessage(); ?>"
 </p>
 <p>
-    We appologize for the inconvience.
+    We apologize for the inconvenience.
     Please use the back button to return to your previous location
-</p>
\ No newline at end of file
+</p>