ngtools/webpack: document i18n parameters

[bwasty]

Bug Report or Feature Request (mark with an x)

- [ ] bug report -> please search issues before submitting
- [x] feature request

The readme doesn't mention any i18n parameters, so we were quite surprised when translations were partially broken after adding the AotPlugin. Digging through the code a bit, we found that these parameters work:

  plugins: [
    new AotPlugin({
      ...
      locale: 'XX',
      i18nFile: helpers.root('src/locale/messages.XX.xlf'),
      i18nFormat: 'xlf',
    }),
  ]

Please document them. An open question is whether it's possible to generate a single bundle with all languages (that's what we're doing now without AOT). My guess after looking through the code is no.

[ocombe]

No you cannot create a unique bundle yet, it'll be a new feature from v5.x (not 5.0, might be 5.1 or later, not sure yet)

[clydin]

The options are now documented within the README of the plugin.

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