Language/translation file in child theme

Hi

i did this solution: https://kriesi.at/support/topic/languagetranslation-file-in-child-theme/
to have the translation inside child theme.

now that the lang folder is in the child theme.
should i placeinside of the folder only the 2 files of the languiage that i translated?
or should i copy the entire content of all languages to that folder in the child theme?

if i will place there only my changed files of 1 language. will the other languages files still will be available from the father theme.
or they all should be from this point only in child theme?