feat(http-loader): handle multiple ressources & silent

[rbalet]

Current behavior

Actually, we can only target one ressource folder

Expected behavior

Being able to select multiple one

What is the motivation / use case for changing the behavior?

Remove the use of the external : https://www.npmjs.com/package/ngx-translate-multi-http-loader library for no additional cost

How do you think that we should implement this?

The http-loader could accept, instead of prefix and suffix, a new resource and/or resources object.

export interface TranslationResource {
  prefix: string
  suffix?: string
  optional?: boolean
}

Optional

We could add an optional variable, which silent the HTTP call if there is an error
(It's also a long time wished issue)

[rbalet]

@CodeAndWeb Can I open a PR for the following ?

I've analysed it and there is no real performance impact on the library.

But people will have to change the way they declare the code, but it does add the new optional variable.
And the change it quite minim (We'll need to notify users on the changelog as this would be a Breaking change)

[CodeAndWeb]

Comments in the PR :-)