bug#26302: [website] translations

[ng0]

One thing I like about the template of https://taler.net is the usage of
javascript free translations of text (jinja2 is used), easy to select
and write.
I think translations of web sites are useful, necessary and important.          
                                                                                
                                                                   
We must provide this in the long run on the Guix web site aswell.