[new feature] add i18n support (#310)

* fix: Tabbar icon line-height

* [new feature] progress add showPivot prop

* [new feature] TabItem support vue-router

* [new feature] update document header style

* [Doc] add toast english ducoment

* [new feature] add i18n support

* feat: Extract demos from markdown

* feat: Base components demos

* [new feature] complete demo extract & translate

* [fix] text cases

* fix: add deepAssign test cases

* fix: changelog detail

* [new feature] AddressEdit support i18n

docs/demos/views/submit-bar.vue

@@ -0,0 +1,76 @@
+<template>
+  <demo-section>
+    <demo-block :title="$t('basicUsage')">
+      <van-submit-bar
+        :price="3050"
+        buttonText="提交订单"
+        @submit="onClickButton"
+      />
+    </demo-block>
+
+    <demo-block :title="$t('disabled')">
+      <van-submit-bar
+        disabled
+        :price="3050"
+        buttonText="提交订单"
+        tip="您的收货地址不支持同城送, 我们已为您推荐快递"
+        @submit="onClickButton"
+      />
+    </demo-block>
+
+    <demo-block :title="$t('loading')">
+      <van-submit-bar
+        loading
+        :price="3050"
+        buttonText="提交订单"
+        @submit="onClickButton"
+      />
+    </demo-block>
+
+    <demo-block :title="$t('advancedUsage')">
+      <van-submit-bar
+        :price="3050"
+        buttonText="提交订单"
+        @submit="onClickButton"
+      >
+        <span slot="tip">
+          您的收货地址不支持同城送, <span class="van-edit-address" @click="onClickEditAddress">修改地址 ></span>
+        </span>
+      </van-submit-bar>
+    </demo-block>
+  </demo-section>
+</template>
+
+<script>
+export default {
+  i18n: {
+    'zh-CN': {
+
+    },
+    'en-US': {
+
+    }
+  },
+
+  methods: {
+    onClickButton() {
+      Toast('点击按钮');
+    },
+
+    onClickEditAddress() {
+      Toast('修改地址');
+    }
+  }
+};
+</script>
+
+<style lang="postcss">
+.demo-submit-bar {
+  .van-submit-bar {
+    position: relative;
+  }
+  .van-edit-address {
+    color: #38F;
+  }
+}
+</style>