chore(client): tweak online users widget

packages/frontend/src/widgets/WidgetOnlineUsers.vue

 <template>
 <div class="mkw-onlineUsers data-cy-mkw-onlineUsers" :class="{ _panel: !widgetProps.transparent, pad: !widgetProps.transparent }">
 	<I18n v-if="onlineUsersCount" :src="i18n.ts.onlineUsersCount" text-tag="span" class="text">
-		<template #n><b>{{ onlineUsersCount }}</b></template>
+		<template #n><b>{{ number(onlineUsersCount) }}</b></template>
 	</I18n>
 </div>
 </template>
@@ -13,6 +13,7 @@ import { GetFormResultType } from '@/scripts/form';
 import * as os from '@/os';
 import { useInterval } from '@/scripts/use-interval';
 import { i18n } from '@/i18n';
+import number from '@/filters/number';
 
 const name = 'onlineUsers';