I assume that the purpose of this tool is to provide a draft translation in the language of the reader, to help the reader to understand the contents of the original, written in a different language.
The tool as it appears on the screenshots does not include any advice concerning the quality of the draft translation produced. There is nothing to explain that the translations produced are not reliable enough to be published, without being edited by someone who understands the languages of the translation and the source, and who preferably also has some knowledge of the subject matter of the source.
I am concerned that as it stands, this translate tool will encourage unsuspecting members of the public to publish translations on a wiki in languages which they do not understand themselves. This has already happened on some language versions of Wikipedia.
I propose that, as a minimum, there should be a warning attached to the tool to say that it should not be used to publish translations which have not been edited by a person who understands both languages.
By the way, the screenshots of the extension in use which have been produced are very useful in understanding the extension and in translating its interface on translatewiki.net. I notice that you do have a short description of the tool in the screenshot. However this has not been included in the messages to be translated at translatewiki.net. Is it intended to include this description as an integral part of the tool, and is the description to be localised on translatewiki.net?