Handle DB_DataObject errors better

We try to handle DB_DataObject errors a little bit better. Previously,
they just spit out a cryptic string to the browser with a suggestion
to turn on debugging (not a good idea!). So, we catch the error, write
the full error message to the log, and then tell users that the can
contact the admins if they need to.

lib/htmloutputter.php

@@ -108,22 +108,26 @@ class HTMLOutputter extends XMLOutputter
         }
 
         header('Content-Type: '.$type);
-        
+
         $this->extraHeaders();
 
         $this->startXML('html',
                         '-//W3C//DTD XHTML 1.0 Strict//EN',
                         'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd');
 
-        // FIXME: correct language for interface
-
-        $language = common_language();
+        $language = $this->getLanguage();
 
         $this->elementStart('html', array('xmlns' => 'http://www.w3.org/1999/xhtml',
                                           'xml:lang' => $language,
                                           'lang' => $language));
     }
 
+    function getLanguage()
+    {
+        // FIXME: correct language for interface
+        return common_language();
+    }
+
     /**
     *  Ends an HTML document
     *
@@ -134,7 +138,7 @@ class HTMLOutputter extends XMLOutputter
         $this->elementEnd('html');
         $this->endXML();
     }
-    
+
     /**
     *  To specify additional HTTP headers for the action
     *