This is the source code of my website on danwin1210.de
Translations are managed in Weblate.
If you prefer manually submitting translations, the script update-translations.sh can be used to update the language template and translation files from source.
It will generate the file locale/main-website.pot which you can then use as basis to create a new language file in YOUR_LANG_CODE/LC_MESSAGES/main-website.po and edit it with a translation program, such as Poedit.
Once you are done, you can open a pull request, or email me, to include the translation.