[Tails-dev] Please review documentation improvements

Hi,


please review the following commits, in matsa / master

* 7a4b449 - add references to "Tails does not start"
* 08636a1 - add l10n tricks
* 107cafc - open-tran.eu is discontinued
* 978f9e1 - fix link
* aca38d5 - clarification


Thanks,
and cheers!