NgDoc: support Multilingual

[why520crazy]

/**
 * description
 * @description.en-us English description
 * @description.zh-cn 中文描述
 */
class SomeComonent {}

output JSON:

{
  "description": "description",
  "description_en-us": "English description"
  "description_zh-cn": "中文描述"
}

or

{
  "description": "description",
  "locales": {
     "zh-cn": {
        "description": "描述"
      },
      "en-us": {
        "description": "English description"
      }
  }
}

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[stale]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.