When you click on the Icon (or select the pair on the PageTranslate menu), a pop-up appears with the following message

'str' object has no attribute 'unescape'
```
Traceback (most recent call last):
  File "/home/malevolent/.config/libreoffice/4/user/uno_packages/cache/uno_packages/lu126545cqxk80.tmp_/PageTranslate.oxt/pagetranslate.py", line 125, in trigger
    self.rewrite_selection(selection)
  File "/home/malevolent/.config/libreoffice/4/user/uno_packages/cache/uno_packages/lu126545cqxk80.tmp_/PageTranslate.oxt/pagetranslate.py", line 218, in rewrite_selection
    trans = self.t.linebreakwise(string)
  File "/home/malevolent/.config/libreoffice/4/user/uno_packages/cache/uno_packages/lu126545cqxk80.tmp_/PageTranslate.oxt/pythonpath/translationbackends.py", line 89, in linebreakwise
    text = "\n\n".join(self.translate(text) for text in text.split("\n\n"))
  File "/home/malevolent/.config/libreoffice/4/user/uno_packages/cache/uno_packages/lu126545cqxk80.tmp_/PageTranslate.oxt/pythonpath/translationbackends.py", line 89, in <genexpr>
    text = "\n\n".join(self.translate(text) for text in text.split("\n\n"))
  File "/home/malevolent/.config/libreoffice/4/user/uno_packages/cache/uno_packages/lu126545cqxk80.tmp_/PageTranslate.oxt/pythonpath/translationbackends.py", line 83, in translate
    return self.fetch(text, lang)
  File "/home/malevolent/.config/libreoffice/4/user/uno_packages/cache/uno_packages/lu126545cqxk80.tmp_/PageTranslate.oxt/pythonpath/translationbackends.py", line 59, in fetch
    text = html.unescape(text)
AttributeError: 'str' object has no attribute 'unescape'
```

Thanks for the report!
I applied a quick patch - for what was essentially a dumb variable collision. (Was broken for all AOO/LO versions, I think.)

This is kinda still in-the-midst of two releases; and there's a few other gotchas still. So not making a new release for now.

Looks good after a couple more tests. Published as 1.7