On line 75 you'll see:

<?php _e( '&larr; Next <span class="hidden-xs">Project</span>', 'willow' ); ?>

Now move &larr; and change it to &rarr; like this:

<?php _e( 'Next <span class="hidden-xs">Project</span> &rarr;', 'willow' ); ?>

Do the same just reverse on line 81 and remember to change &rarr; to &larr;