function accept(sToken) {
				if (aTokens[i] === sToken) {
					i++;
					return true;
				}
				return false;
			}
Parses a language plural rule as specified in
https://unicode.org/reports/tr35/tr35-numbers.html#table-plural-operand-meanings

@param {string} sRule The plural rule as a string
@returns {function(string)} A function to determine for a number given as string parameter if it matches the
  plural rule.

@private