protected void addIrregular(String singular, String plural) {
        requireNonNull(singular);
        requireNonNull(plural);
        irregulars.put(normalize(singular), normalize(plural));
    }
Returns if the provided word is considered as an uncountable.

@param word to check
@return if the provided word is considered as an uncountable
generator-parent/generator-translator/src/main/java/com/speedment/generator/translator/util/Pluralis.java