How to submit a translation for a frappe base module?

While working on my tutorial custom app I have fixed some of the lines in .csv file for my mother language in frappe reports module. Is it possible to submit the .csv directy or do I have to use the translation portal anyway?

The preferred way is to use the translator

If you PR directly the files, chances are high that this is be either not accepted ot overwritten by a later import from the translator.