wpml-config.xml

<wpml-config>
    <custom-types>
        <custom-type translate="0">tb_layout</custom-type>
        <custom-type translate="0">tb_slider</custom-type>
        <custom-type translate="0">tb_sidebar</custom-type>
        <custom-type translate="1">portfolio_item</custom-type>
    </custom-types>
    <taxonomies>
        <taxonomy translate="1">portfolio</taxonomy>
        <taxonomy translate="1">portfolio_tag</taxonomy>
    </taxonomies>
    <custom-fields>
        <custom-field action="translate">_tb_title</custom-field>
        <custom-field action="translate">_tb_breadcrumbs</custom-field>
        <custom-field action="translate">_tb_meta</custom-field>
        <custom-field action="translate">_tb_sub_meta</custom-field>
        <custom-field action="translate">_tb_author_box</custom-field>
        <custom-field action="translate">_tb_related_posts</custom-field>
        <custom-field action="translate">_tb_comments</custom-field>
        <custom-field action="translate">_tb_breadcrumbs</custom-field>
        <custom-field action="translate">_tb_thumb</custom-field>
        <custom-field action="translate">_tb_thumb_link</custom-field>
        <custom-field action="translate">_tb_image_link</custom-field>
        <custom-field action="translate">_tb_video_link</custom-field>
        <custom-field action="translate">_tb_external_link</custom-field>
        <custom-field action="translate">_tb_external_link_target</custom-field>
        <custom-field action="translate">_tb_thumb_link_single</custom-field>
        <custom-field action="translate">_tb_sidebar_layout</custom-field>
        <custom-field action="translate">_tb_layout_header</custom-field>
        <custom-field action="translate">_tb_layout_footer</custom-field>
        <custom-field action="translate">_tb_sidebars</custom-field>
    </custom-fields>
</wpml-config>