should provide disclaimer information

Besides stating the license for the Apertium tools, the main landing page should have a "data statement" that connects the software to the real world (per @emilymbender's recent work).

Types of information that would be good to present (briefly) and/or link to further details on:
* What MT is [good] for, and what it isn't [good] for.
* Sources for data that the pairs were evaluated on.
* Level of involvement or buy-in of the speech communities represented by the various translation pairs (or some statement that all *released* pairs were the result of native speakers being all or part of the process)
* Perhaps a list of contributors to each language module or pair (in place of a statement on the dialect(s) covered or worse, demographic information on each contributor—we need some balance between transparency and privacy here).
* List of publications, both for more information on background, development, and inner workings of each pair, and for something for people to cite.

Ideally each language module and pair should have metadata on these points (contributor GitHub IDs and for the most part names are currently tracked).