Bug 68787 [Markers] Messages need to be converted to the new format
R3.0 The fix for the missing help in the tasks view introduced a missing NL string Non-externalized string literal; it should be followed by //$NON-NLS-<n>$ MarkerView.java org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal line 298
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/ActionDeleteCompleted.java
ErrorDialog
                    .openError(
                            part.getSite().getShell(),
                            Messages
                                    .getString("deleteCompletedTasks.errorMessage"), null, e.getStatus()); 
        }
    }
    private List getCompletedTasks() {
        List completed = new ArrayList();
        MarkerList markerList = part.getVisibleMarkers();
        ConcreteMarker[] markers = markerList.toArray();
        for (int i = 0; i < markers.length; i++) {
            ConcreteMarker marker = markers[i];
            if (marker instanceof TaskMarker) {
                TaskMarker taskMarker = (TaskMarker) marker;
                if (taskMarker.getDone() == 1) {
                    completed.add(taskMarker.getMarker());
                }
            }
        }
        return completed;
    }
    /* (non-Javadoc)
     * @see org.eclipse.ui.actions.SelectionProviderAction#selectionChanged(org.eclipse.jface.viewers.IStructuredSelection)
     */
    public void selectionChanged(IStructuredSelection selection) {
        setEnabled(!selection.isEmpty());
    }
}