Page title provider 

In normal case you only will see something like "detail view" in title of detail page. If you want to change that title to current glossary title you can make use of the TYPO3 page title providers. Luckily glossary2 comes with its own provider to realize a pretty nice detail page-title for you with following TypoScript:

config.pageTitleProviders {
  glossary2 {
    provider = JWeiland\Glossary2\PageTitleProvider\Glossary2PageTitleProvider
    # Load the glossary2 provider before the providers "record" and "seo"
    before = record, seo
  }
}

The page title is only changed on the detail view, which means the request contains the argument tx_glossary2_glossary[glossary]. On all other pages the provider returns an empty title and the next provider of the chain is used.