[Andomar]

The method for Ubuntu posted by swatspyder works for MacOS too! You only have to set the language:

For a "NEW" session, follow these steps...

1. Select Protocol "Local Shell".
2. Create a session name such as "mailserver - FreeBSD - Mosh".
3. Right click on the new session and select "Properties".
4. In the left column, select the category "Logon Options" under "Connection".
5. Check the box that says "Automate Logon".
6. Delete "ogin:" and "assword:" from the list.
7. Click the "Add" button.
8. In the "Send" field, enter the following (modified how you need it):

   export LANG=en_US.UTF-8

9. Click OK to save that send action.
10. Click the "Add" button.
11. In the "Send" field, enter the following (modified how you need it):

    /usr/local/bin/mosh --server="mosh-server new -l LANG=en_US.UTF-8" --ssh="ssh -p [port #]" [username]@[IP ADDR]

12. Click OK to save that send action.