Here are the steps to translate .csv files.
1. Create a translation project
Log in to your POEditor account, create a new translation project and add the base language you'll be translating from.
2. Import .csv file
Use the Import functionality the project page to import your .csv file, with translations in the language you created.
If your .csv file contains string IDs, the translations you import will be automatically suggested as Default Reference Language. You can change the DRL in the project's settings.
3. Add contributors to translate the .csv file
Add the desired languages for translation, invite your contributors to join and start localizing your .csv files.
If you don't have any translators to invite to join your project, there are other translation options available.
Whenever you like, you can export each language using the the Export function in the corresponding translation page.