updateMonthAbbreviations(oResult, sUI5Tag) {
		let oFormerResults;
		try {
			oFormerResults = fileContent.getContent(join(this._sOutputFolder, `${sUI5Tag}.json`));
		} catch (oError) {
			return; // new language tag -> nothing to do; keep the abbreviations as in current CLDR version
		}

		[
			["ca-gregorian", "months", "format", "abbreviated"],
			["ca-gregorian", "months", "stand-alone", "abbreviated"],
			["ca-islamic", "months", "format", "abbreviated"],
			["ca-islamic", "months", "stand-alone", "abbreviated"],
			["ca-japanese", "months", "format", "abbreviated"],
			["ca-japanese", "months", "stand-alone", "abbreviated"],
			["ca-persian", "months", "format", "abbreviated"],
			["ca-persian", "months", "stand-alone", "abbreviated"],
			["ca-buddhist", "months", "format", "abbreviated"],
			["ca-buddhist", "months", "stand-alone", "abbreviated"]
		].forEach((aPropertyPathNames) => {
			Generator.updateAlternatives(oFormerResults, oResult, aPropertyPathNames);
		});
	}
Enhances the month abbreviations in the given result object for the given language with historical alternatives.

@param {Object<string,any>} oResult
  The resulting CLDR object for the given language
@param {string} sUI5Tag
  The UI5 language tag, e.g. "en", "de_CH" or "sr_Latn"