[improvement] optimize single line ellipsis (#334)

* 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

* [bugfix] Search box-sizing wrong

* [Doc] update vant-demo respo

* [Doc] translate theme & demo pages

* [Doc] add Internationalization document

* [bugfix] remove unnecessary props

* [fix] optimize clickoutside

* [new feature] optimize find-parent

* [new feature]: change document title accordinng to language

* [new feature] Pagination code review

* [improvement] adjust icon-font unicode

* [improvement] Icon spinner color inherit

* [improvement] icon default width

* [bugfix] DateTimePicker validate date props

* [bugfix] Tab item text ellipsis

* [improvement] optimize single line ellipsis

packages/vant-css/src/steps.css

@@ -32,31 +32,24 @@
 
   .van-icon {
     font-size: 40px;
-    line-height: 1;
   }
 
   &__message {
-    display: table;
     height: 40px;
     margin: 15px 0;
-
-    .van-steps__message-wrapper {
-      display: table-cell;
-      vertical-align: middle;
-    }
   }
 
   &__title {
     font-size: 14px;
     color: $text-color;
+    padding-top: 4px;
   }
 
   &__desc {
     font-size: 12px;
     line-height: 1.5;
     color: $gray-dark;
-    max-height: 18px;
-    @mixin multi-ellipsis 1;
+    @mixin ellipsis;
   }
 }
 
@@ -140,7 +133,6 @@
       .van-icon {
         font-size: 12px;
         color: $green;
-        line-height: 1;
         display: block;
       }
     }