def get_missing_keys(first_list, second_list):
    """
    Finds all keys in the first list that are not present in the second list

    :param first_list: list of unicode strings
    :param second_list: list of unicode strings
    :return: list of unicode strings
    """
    missing = []
    for key in first_list:
        if key not in second_list:
            missing.append(key)
    return missing