This gave me a system notice while testing, so here's the patch

``` patch
diff --git a/core/timeline_inc.php b/core/timeline_inc.php
index 2f41e56..1824211 100644
--- a/core/timeline_inc.php
+++ b/core/timeline_inc.php
@@ -46,7 +46,7 @@ $t_events = timeline_sort_events( $t_events );
 if ( count( $t_events ) > 0 ) {
    timeline_print_events( $t_events );
 } else {
-   echo '<p>' . $s_timeline_no_activity . '</p>';
+   echo '<p>' . lang_get( 'timeline_no_activity' ) . '</p>';
 }
```