refactor(client): Use symbol

src/client/pages/settings/theme.manage.vue

@@ -38,6 +38,7 @@ import copyToClipboard from '@client/scripts/copy-to-clipboard';
 import * as os from '@client/os';
 import { ColdDeviceStorage } from '@client/store';
 import { getThemes, removeTheme } from '@client/theme-store';
+import * as symbols from '@client/symbols';
 
 export default defineComponent({
 	components: {
@@ -54,7 +55,7 @@ export default defineComponent({
 	
 	data() {
 		return {
-			INFO: {
+			[symbols.PAGE_INFO]: {
 				title: this.$ts._theme.manage,
 				icon: faFolderOpen
 			},
@@ -82,7 +83,7 @@ export default defineComponent({
 	},
 
 	mounted() {
-		this.$emit('info', this.INFO);
+		this.$emit('info', this[symbols.PAGE_INFO]);
 	},
 
 	methods: {