Sixteenth century history was a big politico-religious tangle with plenty of cruelty on all sides. Documents of the time crackle with malice. Other than Margaret Clitheroe it's hard to think of anybody who seemed to be charity clear through.
I'm still quibbling. :-) It was a Catholic court, in Belgium. But you're right, he was convicted of teaching Lutheranism, not of translating the Bible into English.