Do proper date localization

aleksis/apps/alsijil/frontend/components/Coursebook.vue

@@ -13,7 +13,7 @@
           two-line
         >
           <v-list-item-content>
-            <v-list-item-title>{{ day[0].toLocaleString() }}</v-list-item-title>
+            <v-list-item-title>{{ $d(day[0], "short") }}</v-list-item-title>
             <v-list>
               <!-- I know slice copies the array. But show me something better. -->
               <v-list-item v-for="doc in day.slice(1)">