Experimental docs build

[Claude Paroz <claude 2xlibre net>]

Hi all,

I just committed an experimental functionality in Damned Lies to be able 
to build the translated documentation with uploaded po files.
You'll find a new button you can use to generate a build from a po file, 
just below the link to download it.
Hopefully useful for reviewing translations. We'll see if we can use it 
to also prevent XML syntax errors from being committed.

Thanks Andrea for the sysadmin support.

Blessings,

Claude
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