RedSeal theme is delivered with the translation template file, redseal.pot. The file is located in languages folder (/wp-content/themes/{theme}/languages).
Edit the .pot file using a program like Eazy Po. During the translation, strings in corresponding language should be typed into translation fields. From the file menu, save file with your language name e.g de_DE.po. It will generate both a .po and .mo file for your translation. Go to Admin/Settings/General and select Site Language. In our example select Deutsch. Make sure to make a copy of the generated files before you update the theme.