refactor(client): Use symbol

src/client/pages/_error_.vue

@@ -14,6 +14,7 @@
 import { defineComponent } from 'vue';
 import { faExclamationTriangle } from '@fortawesome/free-solid-svg-icons';
 import MkButton from '@client/components/ui/button.vue';
+import * as symbols from '@client/symbols';
 
 export default defineComponent({
 	components: {
@@ -21,7 +22,7 @@ export default defineComponent({
 	},
 	data() {
 		return {
-			INFO: {
+			[symbols.PAGE_INFO]: {
 				title: this.$ts.error,
 				icon: faExclamationTriangle
 			},