Conflict between pdftohtml and poppler plug-in

In order to have preview, errors log says to install pdftohtml.
In the documentation we talk about pdftohtml and poppler without knowing from which version can we use poppler.

Tasks:

• Clean the logs to stop talking about pdftohtml and only talk about poppler.
• Do we have to talk about pdftohtml until a specific FT version?
• Since which Nuxeo version we can only use poppler?