Override a node template and its associated translation I'm trying to understand how to override a node template in order to "catch" also all the associated node translations.

Let's say I have a node/12 in English and its translation is node/13. To override in the same way both nodes I have to create templates/node--12.tpl.php and templates/node--13.tpl.php inside my theme folder.

Is there a way to avoid this, since the customisations I plan to implement on the node and its translation are the same?
You can create a content type for the translations and use that content-type node template. node--CONTENTTYPENAME.tpl.php. 
so you don't need to update it one by one with the node ID.