const FILE_TYPE = ".docx";
const SEPARATOR = "//";
const LANG_PREFIX = "_";

var languageCodes = [
	"czCZ", "daDK", "deDE", "enGB", "esCO", "esES", "frCA", "frFR", "fiFI",
	"huHU", "itIT", "nlNL", "noNO", "plPL", "ptBR", "ruRU", "svSE"];

var sourceFolder = Folder.selectDialog("Select a folder with " + FILE_TYPE + " files");
if (!sourceFolder) exit(0);

var sourceFiles = sourceFolder.getFiles();
for (var i = 0; i < sourceFiles.length; i++) {
  var sourceFile = sourceFiles[i];
  if (sourceFile instanceof File && sourceFile.name.match(FILE_TYPE)) {
    var newSubfolderName = sourceFile.name.replace(FILE_TYPE, "");
    var newSubfolder = createSubfolder(sourceFolder, newSubfolderName);
    duplicateFilesPerLanguage(sourceFile, newSubfolder, languageCodes)
  }
}

function duplicateFilesPerLanguage(file, folder, languageCodes) {
  for (var j = 0; j < languageCodes.length; j++) {
    var nameWithLanguageCode = file.name.replace(FILE_TYPE, LANG_PREFIX + languageCodes[j] + FILE_TYPE);
    var newFile = new File(folder + SEPARATOR + nameWithLanguageCode);
    file.copy(newFile);
  }
}

function createSubfolder(folder, subfolderName) {
  var subfolderPath = folder + SEPARATOR + subfolderName;
  var newFolder = new Folder(subfolderPath);
  if (!newFolder.exists) {
    newFolder.create();
  }
  return newFolder;
}