ember-data with different attribute naming styles

controllers.application\.js

import Controller from '@ember/controller';
import { inject as service } from '@ember/service';
import { action } from '@ember/object';

export default class ApplicationController extends Controller {
  @service intl;
  
  @action changeLocaleToGerman() {
    this.intl.locale = 'de-DE';
  }
}

mirage.config\.js

import Collection from 'ember-cli-mirage/orm/collection';

export default function() {
  this.get('/modules', {
    data: [
      {
        type: "modules",
        id: "1",
        attributes: {
          name: "foo",
          readOnly: true,
          "badges_en-US": [
            "first",
            "second"
          ],
          "badges_de-DE": [
            "erstes",
            "zweites"
          ]
        }
      }
    ]
  });
};

models.module\.js

import Model from 'ember-data/model';
import attr from 'ember-data/attr';
import { inject as service } from '@ember/service';

export default class extends Model {
  @service intl;
  
  // the following lines will be autogenerated by
  // @localizedAttr badge;
  @attr 'badges_de-DE';
  @attr 'badges_en-US';
  
  get badges() {
    const { locale } = this.intl;
    
    return this[`badges_${locale}`];
  }
  
  // some other attributes
  @attr name;
  @attr readOnly;
}

routes.application\.js

import Route from '@ember/routing/route';

export default Route.extend({
  model() {
    return this.store.findAll('module');
  }
});

serializers.application\.js

import JSONAPISerializer from '@ember-data/serializer/json-api';

export default class ApplicationSerializer extends JSONAPISerializer {
  keyForAttribute(key) { return key; }
}

services.intl\.js

import Service from '@ember/service';
import { tracked } from '@glimmer/tracking';

export default Service.extend({
  @tracked locale: 'en-US',
});

templates.application\.hbs

<h1>Welcome to {{this.appName}}</h1>

<button {{on "click" this.changeLocaleToGerman}}>German please</button>

Current locale: {{this.intl.locale}}

{{#each @model as |module|}}
  <h1>{{module.name}}</h1>
  <p>Is readonly? {{module.readOnly}}</p>
  
  <ul>
    {{#each module.badges as |badge|}}
			<li>{{badge}}</li>
    {{/each}}
  </ul>
{{/each}}

twiddle\.json

{
  "version": "0.17.1",
  "ENV": {
    "ember-cli-mirage": {
      "enabled": true
    }
  },
  "EmberENV": {
    "FEATURES": {},
    "_TEMPLATE_ONLY_GLIMMER_COMPONENTS": false,
    "_APPLICATION_TEMPLATE_WRAPPER": true,
    "_JQUERY_INTEGRATION": true
  },
  "options": {
    "use_pods": false,
    "enable-testing": false
  },
  "dependencies": {
    "jquery": "https://cdnjs.cloudflare.com/ajax/libs/jquery/3.5.1/jquery.js",
    "ember": "3.18.1",
    "ember-template-compiler": "3.18.1",
    "ember-testing": "3.18.1"
  },
  "addons": {
    "@glimmer/component": "1.0.0",
    "ember-cli-mirage": "1.1.8",
    "ember-data": "3.18.0"
  }
}