fix issue with locale extension builds

src/editor/extensions/ext-server_opensave/ext-server_opensave.js

@@ -7,13 +7,26 @@
  *
  */
 import {canvg} from '../../../external/canvg/canvg.js';
-import {loadExtensionTranslation} from '../../locale.js';
+
+const loadExtensionTranslation = async function (lang) {
+  let translationModule;
+  try {
+    // eslint-disable-next-line node/no-unsupported-features/es-syntax
+    translationModule = await import(`./locale/${lang}.js`);
+  } catch (_error) {
+    // eslint-disable-next-line no-console
+    console.error(`Missing translation (${lang}) - using 'en'`);
+    // eslint-disable-next-line node/no-unsupported-features/es-syntax
+    translationModule = await import(`./locale/en.js`);
+  }
+  return translationModule.default;
+};
 
 export default {
   name: 'server_opensave',
   async init ({$, decode64, encode64}) {
     const svgEditor = this;
-    const strings = await loadExtensionTranslation('server_opensave', svgEditor.curPrefs.lang);
+    const strings = await loadExtensionTranslation(svgEditor.curPrefs.lang);
     const {
       curConfig: {
         extPath,