Reply To: form filling error messages not translating

For the output of the current language you can download a new beta.

This what I do to translate a resource:
1. Go to resources
2. Click on add new in the top
3. I’m in the normal wordpress post editor and the selected language in the main one
4. After adding the post I go back to the resources and click on its name
5. Configure the resource
6. Back to the resource table, but now I click on the first icon in the right
7. In the post editor I click on the plus beside the second language in the Widget of WPML
8. Translate and saving

That works fine for me.
What do you mean exactly with mixed languages?

Both bugs were fixed in one of the last betas, I think to have answered that in one of your posts too.