Localgov guides blocks translations

[antonio93rs]

We are using localgov guides module on a multilingual project and it looks like some of the blocks are not considering the node translations.
Steps to reproduce

• Create a guide overview page
• Create a couple of guide pages by using the previous overview page as parent
• Translate all the pages and go to the overview page translated version
• The guide page links are not translated and don't point to the translated versions
• The navigation links (prev and next) don't point to the translated versions
  Proposed resolution
  To update GuidesAbstractBaseBlock.php and PageHeaderSubscriber.php so that we consider the translated versions if they exist.
  PR: Issue-3445440: making localgov guides blocks translatable #155