Otherwise the test could run scrapeThisPage() before translators were ready. It
would be good to make scrapeThisPage wait for detection to complete so that an
early press still uses a translator for saving, but this way tests can also
test for the proper icon (though they don't now).
This changes Zotero.Translate.Base.translate() to take an options object (in
order to take a 'collections' parameter, which is passed to the
Zotero.Translate.ItemSaver constructor). The old parameters are still supported
with a deprecation warning, and there may be other places that still need to be
updated.
