Greetings nusty,
To activate the 'Automatic' capture mode, please press 'F8' once when in-game. You can change the hotkey in the Keybindings section. The default capture mode can also be changed under the General section, so that you always use it and don't have to press 'F8' to switch to it.
If you want to be able to click through the translated window, you will have to either set the window to always be click through (found in General section) or set the hotkey for it in the Keybindings section.
Hope that helps. Let me know if you have any other questions.
Thank you!