The woo commerce check-out page does not work with secondary languages

Hello,
we have noticed yesterday that the woo commerce check out page of our e-commerce site doesn’t work with its secondary languages giving this message on the frontend:
[img]https://i.imgur.com/UNba4Jb.png[/img]

After checking, the site returns the following errors:
Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; sidebar_generator has a deprecated constructor in /web/htdocs/www.makemu.it/home/wp-content/themes/unicon/framework/inc/sidebar-generator.php on line 29

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; widget_contact has a deprecated constructor in /web/htdocs/www.makemu.it/home/wp-content/themes/unicon/framework/inc/widgets/contact.php on line 12

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; widget_flickr has a deprecated constructor in /web/htdocs/www.makemu.it/home/wp-content/themes/unicon/framework/inc/widgets/flickr.php on line 12

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; widget_portfolio has a deprecated constructor in /web/htdocs/www.makemu.it/home/wp-content/themes/unicon/framework/inc/widgets/portfolio.php on line 12

Deprecated: Methods with the same name as their class will not be constructors in a future version of PHP; widget_sponsor has a deprecated constructor in /web/htdocs/www.makemu.it/home/wp-content/themes/unicon/framework/inc/widgets/sponsor.php on line 12

Do you have any ideas for the reason of the bug? All the plug-ins are updatet and the site worked fine until yesterday.
Thank you in advance for any suggestions that may help solve our problem.

Best regards
Wiebke

Ticket