Change message in template

app/Template/analytic/burndown.php

@@ -3,7 +3,7 @@
 </div>
 
 <?php if (! $display_graph): ?>
-    <p class="alert"><?= t('Not enough data to show the graph.') ?></p>
+    <p class="alert"><?= t('You need at least 2 days of data to show the chart.') ?></p>
 <?php else: ?>
     <section id="analytic-burndown">
         <div id="chart" data-metrics='<?= json_encode($metrics) ?>' data-date-format="<?= e('%%Y-%%m-%%d') ?>" data-label-total="<?= t('Total for all columns') ?>"></div>