No, there isn't a pronounciatin key yet, however several of the translators have audio files of words. These are denoted when you choose "list all the translation matches" on the Translation Wizard.
As for Esperanto, there are websites written in it that are not be also in English. That's just one example, I'm sure others could think of plenty more.
By clicking on the User Name, you will requery the forum for that user. You will see everything that he or she has posted with that Mudcat name.
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By clicking on the Subject, you will also go to the thread as if you selected it from the original Forum page, but also go directly to that particular message.
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sj