It is best to create a single ost with that includes both launguages.
I have used Google translate to read some post that appeared to have content in them I was interested in. Even with the occasional "miss-translated" word though you can still get the gist of the post.
If it look interesting and you use google translate perhaps copy the translated version in as a reply so that others may see it and read it from there.
Just a thought.
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Yes you are right, It will help others. Plus the people who knows the language could rectify the errors.