添加了一个国际化切换演示页面

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src/views/demo/playground/locales/index.vue

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+<template>
+  <d2-container>
+    <p class="d2-mt-0">
+      <el-radio-group v-model="$i18n.locale">
+        <el-radio-button
+          v-for="language in $languages"
+          :key="language.value"
+          :label="language.value">
+          {{ language.label }}
+        </el-radio-button>
+      </el-radio-group>
+    </p>
+    <el-alert
+      :title="$t('page.demo.playground.locales.text')"
+      type="success">
+    </el-alert>
+    <d2-link-btn
+      slot="footer"
+      title="文档"
+      link="https://doc.d2admin.fairyever.com/zh/sys-locales/"/>
+  </d2-container>
+</template>