static checkTimezoneNames(sCLDRTag, oTimezoneNames) {
		Timezones.checkDuplicateTimezoneNames(sCLDRTag, oTimezoneNames);
		Timezones.getTimezoneIDs(oTimezoneNames).forEach((sTimezoneID) => {
			if (rUnusualTimezoneID.test(sTimezoneID)) {
				console.log("WARNING: Unusual time zone ID found '" + sTimezoneID + "' for locale '" + sCLDRTag
					+ "', maybe check and replace.");
			}
		});
	}
Checks the <code>timezoneNames</code> property of the currently processed locale for duplicate time zone names
and for unusual time zone IDs, like "London/short/daylight". It logs the respective time zone IDs if they are
considered to be unusual.

@param {string} sCLDRTag
  The language tag as defined by the IETF BCP 47, e.g. "en", "de-CH" or "sr-Latn"
@param {Object<string, object>} oTimezoneNames
  The resulting <code>timezoneNames</code> object of the currently processed locale
@throws {Error}
  If there are duplicate time zone names