#6 — Language switching links not preserving current method

[Not sure if this is really a raptus.multilanguageplone-specific problem, since I may have seen a similar issue with LinguaPlone]

When visiting an object with some method appended in the path, e.g.
/foo/bar/some.pdf/view
/foo/bar/folder_contents
the language switcher links don't include the method part;
thus one ends up at (respectively)
/foo/bar/some.pdf
/foo/bar