You can double the fields in every language you use
For example
<?php if( pll_current_language() == 'en' ): ?>
<?php echo get_post_meta($post->ID, 'cinema_text', true); ?>
<?php elseif( pll_current_language() == 'gr' ): ?>
<?php echo get_post_meta($post->ID, 'cinema_text_gr', true); ?>
<?php endif; ?>