Allow to localize to other languages in pontoon.mozilla.org

[ranjithrajv]

Problem:
No standard platform for localization of webthings.io website.

Solution:
Allow to localise webthings.io in pontoon.mozilla.org, the l10n platform for Mozilla projects.

[benfrancis]

@ranjithrajv This is our plan, our team just doesn't know how to do it yet. Do you?

[geryescalier]

https://github.com/mozilla-iot/mozilla-iot.github.io/issues/18#issuecomment-553440627