[Tails-dev] [review'n'merge] Document tails-ux mailinglist

Hi,

Please review and merge these commits:

* [doc/uxml 95e3711] adding tails-ux to the talk page

I saw a strange markup too in this page and the corresponding
translation, so i replaced this here:

* [web/markup b0c0515] replace incorrect html tag


Cheers!
u.