Feature: Support observables for label translations

[ludoviccarretti]

Facilitate the integration of label translations by allowing the use of Observable. This feature allows integration with other
asynchronous services like ngx-translate or other asynchronous APIs.

This PR contains:

• bugfix
• feature
• refactor
• tests
• documentation
• others

Breaking Changes?

• yes
• no

Checklist

• commit messages follow the Conventional Commits pattern
  • A feature commit message is prefixed "feat:"
  • A bugfix commit message is prefixed "fix:"
  • A document related commit is prefixed "docs:"
• docs have been added / updated (for bug fixes / features)

Describe Your Changes

Add the ability to provide label translation using string or Observable to avoid overwriting NgxEditorConfig when language update is needed. By supporting Observable, labels can be translated more easily with modules like ngx-translate. Example of implementation with ngx-translate:

export function ngxEditorConfigFactory(translateService: TranslateService): NgxEditorConfig {
  return {
    locals: {
      // Use stream instead of instant to refresh automatically label when language change
      italic: translateService.stream('styles.italic'),
      bold: translateService.stream('styles.bold'),
    },
  };
}

@NgModule({
  imports: [CommonModule, ReactiveFormsModule, NgxEditorModule.forRoot()],
  providers: [
    {
      useFactory: ngxEditorConfigFactory,
      provide: NGX_EDITOR_CONFIG_TOKEN,
      deps: [TranslateService],
    },
  ],
})
export class MyModule {}

Does this PR affects any existing issues?

• yes
• no

This feature can solve this issue #451 which allows you to manage different languages and update labels without the need to refresh the page or overwrite the editor's configuration manually when display language is updated.

[sibiraj-s]

Thanks @ludoviccarretti . Sorry for the delay. Will check this weekend. Just asking upfront, will this break anythings for existing users? I might have to do a major release then.

[ludoviccarretti]

Thanks @sibiraj-s, no there is no breaking change. This update doesn't require any change for existing user configuration !

[github-actions]

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