Better 2FA input on sign in form (#3910)

* Update signin.vue

* Update ja-JP.yml

* Update settings.vue

* Update signin.vue

* Update init.ts

locales/ja-JP.yml

@@ -27,6 +27,7 @@ common:
   do-not-copy-paste: "ここにコードを入力したり張り付けたりしないでください。アカウントが不正利用される可能性があります。"
   load-more: "もっと読み込む"
   enter-password: "パスワードを入力してください"
+  2fa: "二段階認証"
 
   got-it: "わかった"
   customization-tips:
@@ -855,7 +856,6 @@ desktop/views/components/settings.vue:
   security: "セキュリティ"
   signin: "サインイン履歴"
   password: "パスワード"
-  2fa: "二段階認証"
   other: "その他"
   license: "ライセンス"
   theme: "テーマ"

src/client/app/common/views/components/signin.vue

@@ -10,7 +10,10 @@
 		<span>{{ $t('password') }}</span>
 		<span slot="prefix"><fa icon="lock"/></span>
 	</ui-input>
-	<ui-input v-if="user && user.twoFactorEnabled" v-model="token" type="number" required styl="fill"/>
+	<ui-input v-if="user && user.twoFactorEnabled" v-model="token" type="number" required styl="fill">
+		<span>{{ $t('@.2fa') }}</span>
+		<span slot="prefix"><fa icon="gavel"/></span>
+	</ui-input>
 	<ui-button type="submit" :disabled="signing">{{ signing ? $t('signing-in') : $t('signin') }}</ui-button>
 	<p v-if="meta && meta.enableTwitterIntegration" style="margin: 8px 0;"><a :href="`${apiUrl}/signin/twitter`">{{ $t('signin-with-twitter') }}</a></p>
 	<p v-if="meta && meta.enableGithubIntegration"  style="margin: 8px 0;"><a :href="`${apiUrl}/signin/github`">{{ $t('signin-with-github') }}</a></p>

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

@@ -203,7 +203,7 @@
 		</ui-card>
 
 		<ui-card class="2fa" v-show="page == 'security'">
-			<div slot="title"><fa icon="mobile-alt"/> {{ $t('2fa') }}</div>
+			<div slot="title"><fa icon="mobile-alt"/> {{ $t('@.2fa') }}</div>
 			<section>
 				<x-2fa/>
 			</section>

src/client/app/init.ts

@@ -124,7 +124,8 @@ import {
 	faMapMarker,
 	faRobot,
 	faHourglassHalf,
-	faAlignLeft
+	faAlignLeft,
+	faGavel
 } from '@fortawesome/free-solid-svg-icons';
 
 import {
@@ -257,6 +258,7 @@ library.add(
 	faRobot,
 	faHourglassHalf,
 	faAlignLeft,
+	faGavel,
 
 	farBell,
 	farEnvelope,