[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/radio.css

@@ -1,11 +1,13 @@
 @import "./common/var.css";
 
+$van-radio-size: 20px;
+
 .van-radio {
   overflow: hidden;
 
   &__input {
     position: relative;
-    height: 22px;
+    height: $van-radio-size;
     float: left;
   }
 
@@ -13,21 +15,20 @@
     position: absolute;
     top: 0;
     left: 0;
-    width: 22px;
-    height: 22px;
+    width: $van-radio-size;
+    height: $van-radio-size;
     opacity: 0;
     margin: 0;
   }
 
   &__label {
-    line-height: 22px;
+    line-height: $van-radio-size;
     display: block;
     margin-left: 37px;
   }
 
   .van-icon {
-    font-size: 22px;
-    line-height: 1;
+    font-size: $van-radio-size;
   }
 
   .van-icon-checked {