Spell Checking on Notes 8.5 beta 2

I have been using Notes 8.5 public beta 2 for Linux and it seems pretty good to me except for one little problem that I am not able to solve.

I have copied the brazilian dictionary (brasil.dic) in the lotus/notes/data directory and since then I am able to switch the check spelling to Brazilian Portuguese. This works perfectly for Notes, but it doesn’t for the integrated sametime client.

In the Preferences dialog box, under Sametime → Spellcheck (sorry if I don’t point it precisely, my notes is in portugues), I only get three options (English from Australia, USA or UK). How can I make Brazilian Portuguese available for the sametime client aswell?