refactor(client): Use symbol

src/client/pages/instance/announcements.vue

@@ -34,6 +34,7 @@ import MkButton from '@client/components/ui/button.vue';
 import MkInput from '@client/components/ui/input.vue';
 import MkTextarea from '@client/components/ui/textarea.vue';
 import * as os from '@client/os';
+import * as symbols from '@client/symbols';
 
 export default defineComponent({
 	components: {
@@ -44,7 +45,7 @@ export default defineComponent({
 
 	data() {
 		return {
-			INFO: {
+			[symbols.PAGE_INFO]: {
 				title: this.$ts.announcements,
 				icon: faBroadcastTower
 			},