vote_chart: Add title to the graph

static_files/vote_chart.js

@@ -75,6 +75,13 @@ async function main() {
                     y: {
                         stacked: true
                     }
+                },
+                plugins: {
+                    title: {
+                        display: true,
+                        position: 'bottom',
+                        text: 'Répartition des suppositions'
+                    }
                 }
             }
         })