Google Structured Data 3.1.1 released

This is a maintenance release which contains a set of fixes about errors related to EasyBlog's & HikaShop's integrations and a PHP requirement on multibyte operations.

Changelog

• Fixes SQL syntax error and page break on EasyBlog Preview Mode
• Fixes bug with the Hikashop Integration not generating structured data on products assosiated with a menu item.
• Fixes PHP error Call to undefined function mb_substr()
• Updates Italian (it-IT) translation