Cell code

<?php

function register_bs_footer_init() {
    if ( function_exists('register_dd_layout_cell_type') ) {
        register_dd_layout_cell_type (
            'bs-footer-cell',
            array ( 'name' => __('Theme Footer', 'wpbootstrap'),
                    'description' => __('BootStrap Theme Footer.', 'wpbootstrap'),
                    'category' => __('Theme cells', 'wpbootstrap'),
                    'category-icon-url' => get_template_directory_uri() . '/theme-options/bootstrap-grid/img/icon-16-insert-grid.png',
                    'button-text' => __('Assign Theme Footer Box', 'wpbootstrap'),
                    'dialog-title-create' => __('Create a new Footer Cell', 'wpbootstrap'),
                    'dialog-title-edit' => __('Edit Footer Cell', 'wpbootstrap'),
                    'dialog-template-callback' => 'bs_footer_dialog_template_callback',
                    'cell-content-callback' => 'bs_footer_cell_content_callback',
                    'cell-template-callback' => 'bs_footer_cell_template_callback'
                  )
        );
    }
}
add_action( 'init', 'register_bs_footer_init' );

function bs_footer_cell_content_callback($cell_settings) {
    ob_start();
    ?>
        </div><!-- #main .site-main -->
<footer id="colophon" class="site-footer" role="contentinfo">



        <div class="container">
            <div class="row">
                <div class="col-md-6 col-lg-6">
                    <?php if (has_nav_menu('footer-menu', 'bootstrapwp')) { ?>
                    <nav role="navigation">
                        <?php wp_nav_menu(array(
    'container'       => '',
    'menu_class'      => 'footer-menu',
    'theme_location'  => 'footer-menu')
                                         );
                        ?>
                    </nav>
                    <?php } ?>
                </div>

            </div><!-- .row -->
            <div class="row">
                <div class="col-md-6 col-lg-6">
                    <?php if (minimax_opt('left_footer_area') != '') { ?>
                    <div class="copyright">
                        <?php echo minimax_opt('left_footer_area'); ?>
                    </div>
                    <?php } ?>

                </div>
                <div class="col-md-6 col-lg-6">
                    <div class="social-icons">
                        <?php $social_options = minimax_opt( 'social_icons' ); ?>
                        <?php foreach ( $social_options as $key => $value ) {
    if ( $value ) { ?>
                        <a href="<?php echo $value; ?>" title="<?php echo $key; ?>" target="_blank">
                            <i class="fa fa-<?php echo $key; ?>"></i>
                        </a>
                        <?php }
} ?>
                    </div><!-- .social-icons -->
                </div>
                <div class="col-md-6 col-lg-6">
                    <?php if (minimax_opt('right_footer_area') != '') { ?>
                    <div class="poweredby">
                        <?php echo minimax_opt('right_footer_area'); ?>
                    </div>
                    <?php } ?>
                </div>

            </div><!-- .row -->
        </div><!-- .containr -->


</footer><!-- #colophon -->

</div><!-- #page -->

<?php wp_footer(); ?>

</body>
</html>

    <?php
    $content = ob_get_clean();

    return $content;
}

function bs_footer_cell_template_callback() {
    return '';
}

function bs_footer_dialog_template_callback() {
    ob_start();
    ?>

        <p>
            <?php // allow the user to choose if the widgets should be shown. ?>
            <?php $checkbox_name = get_ddl_name_attr('show_widgets'); ?>
            <label for="<?php echo $checkbox_name; ?>"><?php _e('Show footer widgets', 'wpbootstrap'); ?></label>
            <input type="checkbox" name="<?php echo $checkbox_name; ?>">
        </p>

    <?php

    return ob_get_clean();
}