Some icons changed, first implementation of contact edit

frontend/src/utils/datetime.js

@@ -0,0 +1,9 @@
+import { format } from 'date-fns';
+import { useI18n } from 'vue-i18n';
+
+export function formatDateTimeLong(timestamp) {
+    const { t } = useI18n();
+    const dateFormat = t('general.datetimelong', 'yyyy-MM-dd HH:mm:ss');
+    const date = new Date(timestamp);
+    return format(date, dateFormat);
+}