Add base template for plain prints and optimize PDF generation

Necessary for AlekSIS-App-Kort

aleksis/core/assets/components/notifications/NotificationItem.vue

@@ -22,7 +22,7 @@
 
         <v-list-item-action v-if="notification.link">
           <v-btn text :href="notification.link">
-            {{ $root.django.gettext('More information →') }}
+            {{ $t('notifications.more_information') }} →
           </v-btn>
         </v-list-item-action>