docs(API): 翻译完了 PipeTransform

aio/content/translations/cn/api-plan.md

@@ -90,7 +90,7 @@
 [x]  | forms/ReactiveFormsModule  | 0.18
 [x]  | common/http/HTTP_INTERCEPTORS  | 0.18
 [x]  | platform-browser/DomSanitizer  | 0.18
-[ ]  | core/PipeTransform  | 0.18
+[x]  | core/PipeTransform  | 0.18
 [ ]  | core/SimpleChange  | 0.18
 [ ]  | core/SimpleChanges  | 0.18
 [ ]  | forms/NgSelectOption  | 0.17

packages/core/src/change_detection/pipe_transform.ts

@@ -9,14 +9,22 @@
 /**
  * To create a Pipe, you must implement this interface.
  *
+ * 要创建一个管道，你必须实现该接口。
+ *
  * Angular invokes the `transform` method with the value of a binding
  * as the first argument, and any parameters as the second argument in list form.
  *
+ * Angular 会调用它的 `transform` 方法，并把要绑定的值作为第一个参数传入，其它参数会依次从第二个参数的位置开始传入。
+ *
  * @usageNotes
  * ### Example
  *
+ * ### 例子
+ *
  * The `RepeatPipe` below repeats the value as many times as indicated by the first argument:
  *
+ * 下面的 `RepeatPipe` 会把第一个参数指定的值（`value`）重复很多次（`times`）：
+ *
  * ```
  * import {Pipe, PipeTransform} from '@angular/core';
  *
@@ -30,6 +38,7 @@
  *
  * Invoking `{{ 'ok' | repeat:3 }}` in a template produces `okokok`.
  *
+ * 在模板中调用 `{{ 'ok' | repeat:3 }}` 的结果是 `okokok`。
  *
  */
 export interface PipeTransform { transform(value: any, ...args: any[]): any; }