Method _loadStringsAsync

modules/core/LocalizationSystem.js:233–268

* _loadStringsAsync * Returns a Promise to load the strings for the requested locale * Note that this returns a `Promise.allSettled` because some of these may * fail/reject if a particular language pack doesn't exist. * (For example `core.zh-CN.min.json` exists but `imagery.zh-CC.min.j

(locale)

   * @return {Promise}  Promise resolved when all string loading has settled
   */
  _loadStringsAsync(locale) {
    if (locale.toLowerCase() === 'en-us') {  // `en-US` strings are stored as `en`
      locale = 'en';
    }

    const cache = this._cache;
    if (cache[locale]) {  // already loaded
      return Promise.resolve();
    } else {
      cache[locale] = {};
    }

    // Add the language packs to the AssetSystem's list of sources
    const assets = this.context.systems.assets;
    const origin = assets.origin;          // 'local' or 'latest'
    const sources = assets.sources[origin];
    if (!sources) {
      return Promise.reject(`Unknown origin "${origin}"`);  // shouldn't happen
    }

    const loadPromises = [];
    for (const scope of this._scopes) {
      const key = `l10n_${scope}_${locale}`;
      if (!sources[key]) {
        sources[key] = `data/l10n/${scope}.${locale}.min.json`;
      }
      const prom = assets.loadAssetAsync(key)
        .then(data => {
          cache[locale][scope] = data[locale];
        });

      loadPromises.push(prom);
    }

    return Promise.allSettled(loadPromises);
  }


  /**