message: fixed concatonation error
diff: @@ -212,7 +212,7 @@ class GVL {
  }
  - url += this.addTrailingSlashMaybe(url);
  + url = this.addTrailingSlashMaybe(url);
  if (versionOrVendorList as number > 0) {
  @@ -285,7 +285,7 @@ class GVL {
  }
  - url += this.addTrailingSlashMaybe(url);
  + url = this.addTrailingSlashMaybe(url);
  // load version specified
  url += GVL.langTranslationFilename.replace('[LANG]', lang);
  