I've done:
   1.
   git clone 
https://git-tails.immerda.ch/tails
   2.
   cd tails
   git remote add myrepo tails@???:sekushin/tails
   git remote shows:
   origin
   myrepo
   git remote -v shows:
   myrepo   tails@???:sekushin/tails (fetch)
   myrepo   tails@???:sekushin/tails (push)
   origin   
https://git-tails.immerda.ch/tails (fetch)
   origin   
https://git-tails.immerda.ch/tails (push)
   git fetch --all shows:
   3.
   Host key verification failed.
   fatal: Could not read from remote repository.
   Please make sure you have the correct access rights
   and the repository exists.
   error: Could not fetch myrepo
Then follows the advice to get in touch with the sysadmins or send an email
to the mailing list
<
https://tails.boum.org/contribute/how/translate/#follow-up>.
How can I do that? What email address should I use?
-- 
С уважением,
Дмитрий Секушин
+7 909 55-100-55