7.x change /islandora menu item title to callback

if menu_get_item() would return customizations (eg: title changed via gui), this change wouldn't be necessary. The breadcrumb AWLAYS display 'Islandora Repository' no matter what you change the menu link title to.  Maybe we should use menu_get_active_trail() instead of menu_get_item() here https://github.com/Islandora/islandora/blob/7.x/includes/breadcrumb.inc#L60