Bug(transloco): transloco loader trigger 2 times on scoped translation

[Yberion]

Is there an existing issue for this?

• I have searched the existing issues

Which Transloco package(s) are the source of the bug?

Transloco

Is this a regression?

No (no idea)

Current behavior

When navigating to a page with a scoped translation, it trigger 2 times the loader:

useFallbackTranslation is set to true and both defaultLang and fallbackLang has the same value.

I also suspect another bug, all translation keys are fine on this scoped component, I don't get why it's loading the fallback lang file as there's no error.

Both problem only appear with the scoped translation, it works as expected for the main file.

Expected behavior

If the current lang is the same as the fallbackLang, then it should not load the fallback file as it will already be loaded by default.

If there is no translation error, it should not load the fallback lang file.

Please provide a link to a minimal reproduction of the bug

https://github.com/ngneat/transloco/tree/master/apps/transloco-playground

Change fallbackLang to en, set useFallbackTranslation to true and navigate to the scoped route:

https://github.com/ngneat/transloco/blob/master/apps/transloco-playground/src/app/transloco-root.module.ts#L45-L48

Transloco Config

{
  provide: TRANSLOCO_CONFIG,
  useValue: translocoConfig({
    availableLangs: ['fr-FR', 'en-GB'],
    defaultLang: 'fr-FR',
    fallbackLang: 'fr-FR',
    // Remove this option if your application doesn't support changing language in runtime.
    reRenderOnLangChange: true,
    prodMode: !isDevMode(),
    missingHandler: {
      useFallbackTranslation: true,
    },
  }),
},

Please provide the environment you discovered this bug in

Transloco: 4.2.2
Angular: 15.1.5
Node: 18.13.0
Package Manager: pnpm@7.27.0
Typescript: 4.9.5
OS: Windows 11 22H2

Browser

No response

I would like to make a pull request for this bug

Yes 🚀