Feature request from mage2pro, posted on GitHub Sep 30, 2015
The issue is similar to (but not the same as) https://github.com/magento/magento2/issues/1909 and https://github.com/magento/magento2/issues/1980
My fix with plugins: https://mage2.pro/t/96
Surely the possibility to translate product attributes should be in the core.