public Language getOldLanguage(LanguageID languageID, int majorVersion) {
		OldLanguage oldLang = languageMap.get(new LanguageTag(languageID, majorVersion));
		if (oldLang != null) {
			try {
				oldLang.validate();
				return oldLang;
			}
			catch (Exception e) {
				Msg.error(log, e.getMessage());
			}
		}
		return null;
	}
Return old language if an old language specification file exists for the specified language and version.
@param languageID
@param majorVersion language major version, or -1 for latest version
@return old language or null if specification not found.
Ghidra/Framework/SoftwareModeling/src/main/java/ghidra/program/util/OldLanguageFactory.java