The View.getDisplayName() is used when rendering the breadcrumb but not in the tabs. Thus a view that wants to use a localizable display name becomes confusing to users. For example in the attached screenshot:

Here is a custom view with a view name of s that has overridden getDisplayName() to return a custom name asdjkls. The URL of the page is /view/s/, the breadcrumb bar shows asdjkls but the tab bar title is incorrectly showing as s