After you have finished creating the network sites and you need to translate the strings in your different sites , so you will start using poedit program by downloading and installing it on your laptop from here :

the next step is going using FTP to your site directory and go to CircleFlip >> lang then download CircleFlip.pot and start using it on Poedit .

Start Translating your website strings by choosing a string as shown in the photo and write the translation of it  and then after you have finished save the changes and you are done with Poedit .

After saving the changes you will find two files one is .mo and another with .po

Move both of these files to the same folder (CircleFlip >> lang)

Now,You are done! you can check your website again and enjoy browsing your website after it has got translated.