@ManyToMany(cascade = {CascadeType.MERGE, CascadeType.REFRESH}, fetch = FetchType.EAGER)
    @JoinTable(
            name = "i18n_string_values_map",
            joinColumns = {@JoinColumn(name = "id_i18n_string", nullable = false)},
            inverseJoinColumns = {@JoinColumn(name = "id_i18n_string_value", nullable = false)},
            uniqueConstraints = {@UniqueConstraint(columnNames = {"language_iso_code", "id_i18n_string"})}
    )
    @MapKeyJoinColumn(name = "language_iso_code", nullable = false)
    @MapKeyClass(Language.class)
    private Map<Language, I18nStringValue> mapping;