Angular extract i18n and reverse-merge

This extends Angular CLI to improve the i18n extraction. It adds functionality to reverse-merge target translation files
back to source code

Install

_Prerequisites_: i18n setup with defined target locales in angular.json - as
documented here.

``shell
ng add ng-extract-i18n-reverse
`

Usage

`shell
ng extract-i18n # yes, same as before - this replaces the original builder
`

$3

In your angular.json the target extract-i18n that can be configured with the following options:

| Name | Default | Description |
|-----------------|------------------------------------------------------------------|---------------------------------------------------------------------------------------------------------------------------------------------------------|
| browserTarget | Inferred from current setup by ng add | A browser builder target to extract i18n messages in the format of project:target[:configuration]. See https://angular.io/cli/extract-i18n#options |
| format | Inferred from current setup by ng add | Any of xlf, xlif, xliff, xlf2, xliff2 |
| outputPath | Inferred from current setup by ng add | Path to folder containing all (source and target) translation files. |
| targetFiles | Inferred from current setup by ng add | Filenames (relative to outputPath of all target translation files (e.g. ["messages.fr.xlf", "messages.de.xlf"]). |
| sourceFile | messages.arb. ng add tries to infer non default setups. | Filename (relative to outputPath of source translation file (e.g. "translations-source.arb"). |
| targetPath | none | Path to folder containing target file for further comparison |
| targetFile | messages.en-US.arb. ng add tries to infer non default setups.| Filename (relative to targetPath of target translation file which is used for further comparison with source file (e.g. "translations-target.arb"). |
| check | false`. | Whether to compare target file with source file to find differences |

Contribute

Feedback and PRs always welcome :-)

Before developing complex changes, I'd recommend opening an issue to discuss whether the indented goals match the scope of this package.