It is possible for each agent to change its language, which will make the Unbabel app assume that to be the language the agent is writing in. An agent can only change its own language preferences.
One can see the current selection and make any changes by clicking the cogwheel icon above the Unbabel logo in the widget:
The agent language is changed in the Your language: field by selecting it from the dropdown list and clicking Save. This will re-translate all chat messages taking into consideration the new selection.
If the selection configures an nonexistent language pair, a message reading We don't support translations between X and Y will display.