Use your favorite tools to edit the .po
files.
To translate an intllib-supporting mod to your desired language, copy the
locale/template.txt
file to locale/LANGUAGE.txt
(where LANGUAGE
is the
ISO 639-1 Language Code of your language.
Open up the new file in your favorite editor, and translate each line putting the translated text after the equals sign.
See localefile.md
for more information about the file format.