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The breadcrumb title of the site map doesn't seem to change with the admin config (admin/config/search/sitemap), although the title of the page itself does.
It looks like the breadcrumb gets the title from Drupal's menu system, and the sitemap module doesn't change the value of the title on its hook_menu.
This patch creates a title callback for the hook_menu which checks for the variable and sets the title accordingly.
Please let me know if this is the best way of dealing with this issue.