I write texts in english, french and german, my interface is in french.
Each time I create a new document, I have to change the language by doing in Tools>Language>For the whole text. Here only french is proposed (or "no correction") so I have to select "More.." and change in the Settings.
It's quite a long path if you need to write a lot of documents.
It would be great to have it in the status bar (for instance) and a right click would give all possible language (I have only theses 3 on my system, and I guess that nobody installs all language packages)
I realized that the issue was not in Writer but Impress
For me important to have, but I mark it as Resolved / Duplicate because it was already reported in the past.
*** This bug has been marked as a duplicate of bug 34141 ***