[w3c/manifest] i18n support (#848)

currently manifest only support a string for key `name` and `short_name`.

I would like to suggest, they use i18n based object to represent  i18n strings.

for example:

from 
```
{
name: "An Angular Based Application"
short_name: "angular"
}
```

to 

```
{
name:  {
"en" : "An Angular Based Application",
"zh" : "一个基于角度的程序",
"ja" : "角度ベースのアプリケーション",
}，
short_name: {
"en" : "Angular",
"zh" : "角度",
"ja" : "角度",
}
}
```


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