[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/tab.vue

@@ -0,0 +1,112 @@
+<template>
+  <demo-section>
+    <demo-block :title="$t('basicUsage')">
+      <van-tabs :active="active">
+        <van-tab :title="$t('tab') + index" v-for="index in 4" :key="index">
+          {{ $t('content') }} {{ index }}
+        </van-tab>
+      </van-tabs>
+    </demo-block>
+
+    <demo-block :title="$t('title2')">
+      <van-tabs>
+        <van-tab v-for="index in 8" :title="$t('tab') + index" :key="index">
+          {{ $t('content') }} {{ index }}
+        </van-tab>
+      </van-tabs>
+    </demo-block>
+
+    <demo-block :title="$t('title3')">
+      <van-tabs @disabled="onClickDisabled">
+        <van-tab v-for="index in 4" :title="$t('tab') + index" :disabled="index === 2" :key="index">
+          {{ $t('content') }} {{ index }}
+        </van-tab>
+      </van-tabs>
+    </demo-block>
+
+    <demo-block :title="$t('title4')">
+      <van-tabs type="card">
+        <van-tab v-for="index in 4" :title="$t('tab') + index" :key="index">
+          {{ $t('content') }} {{ index }}
+        </van-tab>
+      </van-tabs>
+    </demo-block>
+
+    <demo-block :title="$t('title5')">
+      <van-tabs @click="handleTabClick">
+        <van-tab v-for="index in 4" :title="$t('tab') + index" :key="index">
+          {{ $t('content') }} {{ index }}
+        </van-tab>
+      </van-tabs>
+    </demo-block>
+  </demo-section>
+</template>
+
+<script>
+export default {
+  i18n: {
+    'zh-CN': {
+      tab: '选项 ',
+      title2: '横向滚动',
+      title3: '禁用标签',
+      title4: '样式风格',
+      title5: '点击事件'
+    },
+    'en-US': {
+      tab: 'Tab ',
+      content: 'content of tab',
+      title2: 'Swipe Tabs',
+      title3: 'Disabled Tab',
+      title4: 'Card Style',
+      title5: 'Click Event'
+    }
+  },
+
+  data() {
+    return {
+      active: 2
+    };
+  },
+
+  mounted() {
+    setTimeout(() => {
+      this.active = 3;
+    }, 1000);
+  },
+
+  methods: {
+    onClickDisabled() {
+      Toast('Disabled!');
+    },
+
+    handleTabClick(index) {
+      Toast(index);
+    }
+  }
+};
+</script>
+
+<style lang="postcss">
+.demo-tab {
+  .van-tab__pane {
+    background-color: #fff;
+    padding: 20px;
+  }
+
+  .van-tabs--card .van-tab__pane {
+    background-color: transparent;
+  }
+
+  .custom-tabwrap .van-tab-active {
+    color: #20a0ff;
+  }
+  .custom-tabwrap .van-tabs-nav-bar {
+    background: #20a0ff;
+  }
+  .custom-pane {
+    text-align: center;
+    height: 50px;
+    line-height: 50px;
+  }
+}
+</style>