[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

packages/dialog/dialog.vue

@@ -14,7 +14,7 @@
           v-show="showCancelButton"
           @click="handleAction('cancel')"
         >
-          {{ cancelButtonText }}
+          {{ cancelButtonText || $t('cancel') }}
         </van-button>
         <van-button
           size="large"
@@ -22,7 +22,7 @@
           v-show="showConfirmButton"
           @click="handleAction('confirm')"
         >
-          {{ confirmButtonText }}
+          {{ confirmButtonText || $t('confirm') }}
         </van-button>
       </div>
     </div>
@@ -32,6 +32,7 @@
 <script>
 import Button from '../button';
 import Popup from '../mixins/popup';
+import { i18n } from '../locale';
 
 export default {
   name: 'van-dialog',
@@ -40,9 +41,11 @@ export default {
     [Button.name]: Button
   },
 
-  mixins: [Popup],
+  mixins: [Popup, i18n],
 
   props: {
+    confirmButtonText: String,
+    cancelButtonText: String,
     title: {
       type: String,
       default: ''
@@ -59,14 +62,6 @@ export default {
       type: Boolean,
       default: false
     },
-    confirmButtonText: {
-      type: String,
-      default: '确认'
-    },
-    cancelButtonText: {
-      type: String,
-      default: '取消'
-    },
     callback: {
       type: Function
     },