Update settings.2fa.vue (#3593)

src/client/app/desktop/views/components/settings.2fa.vue

 <template>
 <div class="2fa">
-	<p style="margin-top:0;">{{ $t('intro') }}<a :href="$t('href')" target="_blank">{{ $t('detail') }}</a></p>
+	<p style="margin-top:0;">{{ $t('intro') }}<a :href="$t('url')" target="_blank">{{ $t('detail') }}</a></p>
 	<ui-info warn>{{ $t('caution') }}</ui-info>
 	<p v-if="!data && !$store.state.i.twoFactorEnabled"><ui-button @click="register">{{ $t('register') }}</ui-button></p>
 	<template v-if="$store.state.i.twoFactorEnabled">