test: demo snapshot uses enUS

src/list/test/__snapshots__/demo.spec.js.snap

@@ -11,7 +11,7 @@ exports[`should render demo and match snapshot 1`] = `
            aria-selected="true"
       >
         <span class="van-tab__text van-tab__text--ellipsis">
-          基础用法
+          Basic Usage
         </span>
       </div>
       <div role="tab"
@@ -19,7 +19,7 @@ exports[`should render demo and match snapshot 1`] = `
            aria-selected="false"
       >
         <span class="van-tab__text van-tab__text--ellipsis">
-          错误提示
+          Error Info
         </span>
       </div>
       <div role="tab"
@@ -27,7 +27,7 @@ exports[`should render demo and match snapshot 1`] = `
            aria-selected="false"
       >
         <span class="van-tab__text van-tab__text--ellipsis">
-          下拉刷新
+          PullRefresh
         </span>
       </div>
       <div class="van-tabs__line"
@@ -62,7 +62,7 @@ exports[`should render demo and match snapshot 1`] = `
               </svg>
             </span>
             <span class="van-loading__text">
-              加载中...
+              Loading...
             </span>
           </div>
         </div>