A browser:page is essentially just a browser: a view directive with additional template support. You can set the title using the zcml directive, as you can for browser:view .
To set the title for the display menu, add the menu and title attributes to the browser:page directive:
menu="plone_displayviews" title="title goes here"
You may also need to explicitly enable ZCML for plone.app.contentmenu to make sure the plone_displayviews menu is plone_displayviews :
<include package="plone.app.contentmenu" />
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