Besides this, you can use a PoEdit platform. You can add translation via editing your .po file and at the end, PoEdit generates .mo file for you. Then you can upload ready translation files to primordial folder (../wp-content/themes/theme-folder/languages/). Before adding translations for static strings it needs to rename language files correctly according to your site languages. You can find a list of language codes at WordPress in your Language. As an example, the language code for French is fr_FR, so you would save the translated files as fr_FR.po first, then fr_FR.mo.
In order to save your translations during theme updates, we recommend saving them in ../wp-content/languages/themes/ folder.