For example, I wanted to try it on <https://de.wikipedia.org/wiki/Spezial:Helferlein>, but I got a mixed content error:
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[17:37:15.050] Blocked loading mixed active content "http://labs.microsofttranslator.com/bookmarklet/default.aspx?f=js&to=en" @ javascript:(function(){var%20s%20=%20document.createElement('script');%20s.type%20=%20'text/javascript';%20s.src%20=%20'http://labs.microsofttranslator.com/bookmarklet/default.aspx?f=js&to=en';%20document.body.insertBefore(s,%20document.body.firstChild);})():1
I tried removing the "http:" to turn that into a protocol-relative address, but the https:// version of the URL doesn't return any javascript code :-(.