Change the settings, watch the real banner change. Copy the values into your site's settings page when you like what you see.
The plugin ships with these translations. They are the real strings from the plugin's .po files — this is what your visitors would see.
The light palette is used.
Editing the light palette. Both palettes are stored; which one shows depends on the colour mode.
On your site the link appears by itself, pointing at the page you marked under Settings → Privacy. It only disappears if you have not marked one.
Leave both empty to use the built-in wording, which is translated into all 11 bundled languages. Type something and it is used literally, in every language.
Your text stays as you typed it while the buttons switch language — that is the plugin's actual behaviour, not a glitch in the preview. Empty the field to get the translated default back.
HttpOnly cookies — the browser does not permit that from JavaScript. Blocking the script before it runs is the part that actually works; deletion is cleanup, not a guarantee.