responsive slider translation

/* Echo the field. */
    ?>
    <input type="text" id="slide_width" name="responsive_slider_options[slide_width]" value="<?php echo $slide_width; ?>" /> <span class='description'><?php _e( 'px', 'responsive-slider' ) ; ?></span>
    <?php

    /* Echo the field. */
    ?>
    <input type="text" id="slide_height" name="responsive_slider_options[slide_height]" value="<?php echo $slide_height; ?>" /> <span class='description'><?php _e( 'px', 'responsive-slider' ) ; ?></span>
    <?php

    /* Echo the field. */
    ?>
    <input type="text" id="slide_delay" name="responsive_slider_options[slide_delay]" value="<?php echo $slide_delay; ?>" /> <span class="description"><?php _e( 'milliseconds', 'responsive-slider' ) ; ?></span>
    <?php

    /* Echo the field. */
    ?>
    <input type="text" id="slide_duration" name="responsive_slider_options[slide_duration]" value="<?php echo $slide_duration; ?>" /> <span class="description"><?php _e( 'milliseconds', 'responsive-slider' ) ; ?></span>
    <?php