You can translate the theme from here:
https://translate.wordpress.org/projects/wp-themes/illdy/
Once you finish translation (ideally more than 90% of the plugin “stable” sub-project), ask your locale’s translation team to approve your suggestions: https://make.wordpress.org/polyglots/handbook/translating/after-your-contribution
You can reach out to them via the local Slack or forums, as listed on their translation guide. If no instruction is found, then you can post your request on a global blog.
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Another way to translate without the review process is to use Poedit.
1. Download a free Poedit app from the link above.
2. Create a copy of languages/illdy.po file and rename it to illdy-LOCALE.po (LOCALE should match the WP locale name you are translating for; e.g. es_ES, ja).
3. Move the renamed file to wp-content/languages/themes.
4. Open that file with Poedit and translate it.
5. When you save the change, illdy-LOCALE.mo file is created. This will serve as your theme’s language file.
