How to change the language of the whole document in LibreOffice

On my fedora 22 box, in libreoffice 4.4.4 a new document gets the German language for spell checking per default.

This is shown on the bottom status line:

By right clicking on this area the language can be changed from the current point of writing until it
is changed again.

But my whole document should be changed to English, also the already written part.

Here you open Tools/Options/ and search for Languages and select the Default Language for the
document but don't forget to check the "For the current document only" checkbox.

Now the whole document is in the different language.

The hint was found in the German LibreOffice-Help.