Er, that should be wfMsg()...

diff --git a/includes/OutputPage.php b/includes/OutputPage.php
index f5a0eb3..25ff449 100644 (file)
--- a/includes/OutputPage.php
+++ b/includes/OutputPage.php
@@ -895,7 +895,7 @@ class OutputPage {
                }
 
                if( is_string( $source ) ) {
-                       $this->addWikiText( 'viewsourcetext' );
+                       $this->addWikiText( wfMsg( 'viewsourcetext' ) );
                        if( $source === '' ) {
                                global $wgTitle;
                                if ( $wgTitle->getNamespace() == NS_MEDIAWIKI ) {