I did wrote about the issue over https://processwire.com/talk/topic/31011-adding-language-changing-language-is-not-reflecting-on-the-front-end/
What I noticed is when new language is added, it is not adding value to the page id 1, which have a name* field and is missing the new value.

The behaviour when we rename the existing language code ( de => uk ) is not updating this field value.
I did wrote about the issue over https://processwire.com/talk/topic/31011-adding-language-changing-language-is-not-reflecting-on-the-front-end/
What I noticed is when new language is added, it is not adding value to the page id 1, which have a name* field and is missing the new value.
The behaviour when we rename the existing language code ( de => uk ) is not updating this field value.