Issue #880: Simple misspelling ('occured') in web error message.

templates/error.tmpl

@@ -6,7 +6,7
 <h2>Mercurial Error</h2>
 
 <p>
-An error occured while processing your request:
+An error occurred while processing your request:
 </p>
 <p>
 #error|escape#

templates/gitweb/error.tmpl

@@ -17,7 +17,7
 
 <div class="page_body">
 <br/>
-<i>An error occured while processing your request</i><br/>
+<i>An error occurred while processing your request</i><br/>
 <br/>
 {error|escape}
 </div>

tests/test-hgweb.out

@@ -35,7 +35,7 404 Not Found
 <h2>Mercurial Error</h2>
 
 <p>
-An error occured while processing your request:
+An error occurred while processing your request:
 </p>
 <p>
 Not Found