public boolean isCjk() {
        return switch (this) {
            case CHINESE_SIMPLIFIED, CHINESE_TRADITIONAL, JAPANESE, KOREAN, THAI -> true;
            default -> false;
        };
    }
Returns whether this is a "cjk" language. CJK is here not a linguistic term, it is basically whether the language
has loose word order and a non-rigid use of space.

@return True if this is a CJK language.
linguistics/src/main/java/com/yahoo/language/Language.java