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const toReplaced = ["", "en"];

const newLanguage = "en-US";


zoteroPane = Zotero.getActiveZoteroPane();
items = zoteroPane.getSelectedItems();
var rn = 0; 
for (item of items) {
  var la = item.getField("language");
  if (la in toReplaced) {
    
    item.setField("language", newLanguage);
    rn += 1;
    await item.saveTx();
  }
}
return rn + "个条目语言被替换为" + newLanguage + "。";