improve loading of extension locales with fallback

src/editor/locale.js

@@ -364,3 +364,24 @@ export const putLocale = async function (givenParam, goodLangs) {
   const module = await import(`./locale/lang.${langParam}.js`);
   return readLang(module.default);
 };
+
+/**
+ *
+ * @function module:locale.loadExtensionTranslation
+ * @param {string} extensionName
+ * @param {string} lang
+ * @returns {string} lang will will returned if the translation exists else it will be 'en'
+*/
+export const loadExtensionTranslation = async function (extensionName, lang) {
+  let translationModule;
+  try {
+    // eslint-disable-next-line node/no-unsupported-features/es-syntax
+    translationModule = await import(`./extensions/ext-${extensionName}/locale/${lang}.js`);
+  } catch (_error) {
+    // eslint-disable-next-line no-console
+    console.error(`Missing translation (${lang}) for extension ${extensionName} - using 'en'`);
+    // eslint-disable-next-line node/no-unsupported-features/es-syntax
+    translationModule = await import(`./extensions/ext-${extensionName}/locale/en.js`);
+  }
+  return translationModule.default;
+};