Add info for additional languages to customizing documentation (#1323)

Clarifications on adding a new language.

Signed-off-by: Sasha Romijn <[email protected]>

Author: apio-sys

documentation/Customize.md

@@ -17,8 +17,27 @@ adding the above files.
 
 You need to translate all the strings in `main.po`.
 
+To add a new meny entry for the new language:
+* add the language to `internet.nl/settings.py`
+* update `webserver/nginx_templates/app.conf.template` to include the language
+* update `docker/webserver/certbot.sh` to request LE certs for the new subdomain
+
+This presumes you
+have the corresponding DNS entries already created, such as
+
+```
+[lang].example.nl
+[lang].fr.ipv6.example.nl
+[lang].conn.example.nl
+[lang].conn.ipv6.example.nl
+```
+
+where [lang] is the 2 letter ISO 639-1 language code.
+
+Then, update the site using the procedure in [documentation/Docker-forked.md](Docker-forked.md) to rebuild the front accordingly.
+
 For `news.po` you can provide your own news/blogs but you need to follow the
-existing conventions.
+existing conventions. (**FIXME**: this needs further clarification)
 
 
 ## Scores