docs: Translation of Input component and its demos. (ant-design#2789)

components/input/demo/addon.md

@@ -1,10 +1,18 @@
 ---
 order: 2
-title: 前置/后置标签
+title:
+    zh-CN: 前置/后置标签
+    en-US: Pre / Post tab
 ---
 
+## zh-CN
+
 用于配置一些固定组合。
 
+## en-US
+
+Using pre & post tabs example.
+
 ````jsx
 import { Input, Select } from 'antd';
 const Option = Select.Option;

components/input/demo/autosize-textarea.md

@@ -1,18 +1,28 @@
 ---
 order: 6
-title: 适应文本高度的文本域
+title:
+    zn-CN: 适应文本高度的文本域
+    en-US: Autosizing the height to fit the content
 ---
 
+## zh-CN
+
 `autosize` 属性适用于 `textarea` 节点，并且只有高度会自动变化。另外 `autosize` 可以设定为一个对象，指定最小行数和最大行数。
 
+## en-US
+
+`autosize` prop for a `textarea` type of `Input` makes the height to automatically adjust based on the content.
+An options object can be provided to `autosize` to specify the minimum and maximum number of lines the textarea will automatically adjust.
+
+
 ````jsx
 import { Input } from 'antd';
 
 ReactDOM.render(
   <div>
-    <Input type="textarea" placeholder="自适应内容高度" autosize />
+    <Input type="textarea" placeholder="Autosize height based on content lines" autosize />
     <div style={{ margin: '24px 0' }} />
-    <Input type="textarea" placeholder="有最大高度和最小高度" autosize={{ minRows: 2, maxRows: 6 }} />
+    <Input type="textarea" placeholder="Autosize height with minimum and maximum number of lines" autosize={{ minRows: 2, maxRows: 6 }} />
   </div>
 , mountNode);
 ````

components/input/demo/basic.md

@@ -1,10 +1,18 @@
 ---
 order: 0
-title: 基本使用
+title:
+    zn-CN: 基本使用
+    en-US: Basic usage
 ---
 
+## zh-CN
+
 基本使用。
 
+## en-US
+
+Basic usage example
+
 ````jsx
 import { Input } from 'antd';
 

components/input/demo/group.md

@@ -1,10 +1,18 @@
 ---
 order: 3
-title: 输入框组合
+title: 
+    zn-CN: 输入框组合
+    en-US: Input Group
 ---
 
+## zh-CN
+
 输入框的组合展现。
 
+## en-US
+
+Input.Group example
+
 ````jsx
 import { Input, Col } from 'antd';
 const InputGroup = Input.Group;

components/input/demo/search-input.md

@@ -1,10 +1,18 @@
 ---
 order: 4
-title: 搜索框
+title:
+    zn-CN: 搜索框
+    en-US: Search box
 ---
 
+## zh-CN:
+
 带有搜索按钮的输入框。
 
+## en-US:
+
+Example of creating a search box by grouping a standard input with a search button.
+
 ````jsx
 import { Input, Button } from 'antd';
 import classNames from 'classnames';

components/input/demo/size.md

@@ -1,20 +1,30 @@
 ---
 order: 1
-title: 三种大小
+title: 
+    zh-CN: 三种大小
+    en-US: Three sizes of Input
 ---
 
+## zh-CN
+
 我们为 `<Input />` 输入框定义了三种尺寸（大、默认、小），高度分别为 `32px`、`28px` 和 `22px`。
 
 注意： 在表单里面，我们只使用大尺寸的输入框。
 
+## en-US
+
+There are three sizes of an Input box: `large` (32px)、`default` (28px) and `small` (22px). 
+
+Note: Inside of forms, only the large size is used.
+
 ````jsx
 import { Input } from 'antd';
 
 ReactDOM.render(
   <div className="example-input">
-    <Input size="large" placeholder="大尺寸" />
-    <Input placeholder="默认尺寸" />
-    <Input size="small" placeholder="小尺寸" />
+    <Input size="large" placeholder="large size" />
+    <Input placeholder="default size" />
+    <Input size="small" placeholder="small size" />
   </div>
 , mountNode);
 ````
@@ -24,4 +34,4 @@ ReactDOM.render(
   width: 200px;
   margin: 0 8px 8px 0;
 }
-````
+````

components/input/demo/textarea.md

@@ -1,10 +1,18 @@
 ---
 order: 5
-title: 文本域
+title:
+    zh-CN: 文本域
+    en-US: Textarea
 ---
 
+## zh-CN
+
 用于多行输入，指定 `type` 为一个特殊的 `textarea`。
 
+## en-US
+
+For multi-line user input cases, an input whose `type` prop has the value of `"textarea"` can be used.
+
 ````jsx
 import { Input } from 'antd';
 

components/input/index.en-US.md

@@ -0,0 +1,47 @@
+---
+category: Components
+chinese: 输入框
+type: Form Controls
+english: Input
+---
+
+A basic widget for getting the user input is a text field.
+Keyboard and mouse can be used for providing or changing data.
+
+## When to Use
+
+- A user input in a form field is needed.
+- A search input is required.
+
+## API
+
+### Input
+
+| Property       | Description           | Type     | Available Values | Default       |
+|----------------|-----------------------|----------|------------------|---------------|
+| type | The type of input. For a multi-line input, the 'textarea' value can be used. | string | 'text' or 'textarea' | 'text'    |
+| id | The identifier. | number or string |   |   |
+| value | The content value. | any |   |   |
+| defaultValue | The initial value. | any |   |   |
+| size | The size of the input box. The implicit value is 'default'. Note: in the context of a form, the 'large' size is used. | string | {'large','default','small'} | 'default' |
+| disabled | Tell if the input is disabled. | bool |   | false |
+| addonBefore | The label text displayed before (on the left side of) the input field. | node |   |   |
+| addonAfter | The label text displayed after (on the right side of) the input field. | node |   |   |
+| onPressEnter | The callback function that is triggered when pressing Enter key. | function(e) |   |   |
+| autosize | Height autosize feature, available when type="textarea". | bool or object | `true` or `{ minRows: 2, maxRows: 6 }` | false |
+
+> When `Input` is used in a `Form.Item` context, if the `Form.Item` has the `id` and `options` props defined  
+then `value`, `defaultValue`, and `id` props are automatically set.
+
+#### Input.Group
+
+| Property  | Description                      | Type   | Available Values            | Default   |
+|-----------|----------------------------------|--------|-----------------------------|-----------|
+|  size | The size of `Input.Group` specifies the size of the included `Input` fields. | string | {'large','default','small'} | 'default' |
+
+```html
+<Input.Group className={string}>
+  <Input />
+  <Input />
+</Input.Group>
+```