async loadCoreTranslationsFallback () {
			let first = Object.keys(translations)[0];
			if (first) {
				Log.log(`Loading core translation fallback file: ${translations[first]}`);
				this.coreTranslationsFallback = await loadJSON(translations[first]);
			}
		}
Load the core translations' fallback.
The first language defined in translations.js will be used.