code: private static String getPluralCaseOpenString(SoyMsgPluralCaseSpec pluralCaseSpec) {
      String icuCaseName =
          (pluralCaseSpec.getType() == SoyMsgPluralCaseSpec.Type.EXPLICIT)
              ? "=" + pluralCaseSpec.getExplicitValue()
              : pluralCaseSpec.getType().name().toLowerCase();
      return icuCaseName + "{";
    }
docs: Gets the opening (left) string for a plural case statement.
  
  @param pluralCaseSpec The plural case spec object.
  @return the ICU syntax string for the plural case opening string.