@NotNull
  public static String getSuffix(@NotNull PropertiesFile propertiesFile) {
    final String baseName = propertiesFile.getResourceBundle().getBaseName();
    final String propertiesFileName = propertiesFile.getName();
    if (baseName.equals(FileUtilRt.getNameWithoutExtension(propertiesFileName))) return "";
    return FileUtilRt.getNameWithoutExtension(propertiesFileName.substring(baseName.length() + 1));
  }
@NotNull
  public static String getSuffix(@NotNull PropertiesFile propertiesFile)