It took quite some time to make this plugin as dynamic as possible.
As you can read here about the Language Field Plugin we are now going a little further.
The WordPress plugin has the ability that you can create multiple languages as fields, which means those fields you later can select per article.
Going to Settings -> Language Field you can add your languages. Remember according to the WordPress in your language you need to add your language code like “de-DE”. Second you select a short name for this. In this case we choose “de” and as name “German”.
Now write an article and select your created language in the Language Metabox on your edit post screen.
Now only this article might be german and you can filter out with the no function language widget.