After reading this I searched for a software that helps with this.
I found pandoc http://pandoc.org/
sudo apt-get install pandoc
It can convert MediaWiki format to html format
The only thing that have to take into account is not to copy directly from
wiki (as it is messed up), instead, go first to "Edit" and copy the text from
there, as it will have the proper format.
Then using pandoc see
http://pandoc.org/getting-started.html#step-6-converting-a-file for more
information, also http://pandoc.org/MANUAL.html#using-pandoc
pandoc -f mediawiki -t html document
Then you can replace the text in the same Edit form and lastly change at the
bottom from Wiki format to html
Save it and now it will work :)
We are doing this in spanish wiki and it seems better now.