Information on trying the 2.0 beta can be found on page 1 of this thread, two posts back.
I have taken another of Mikola's good ideas and added the new client-side translations feature of MT5.0 to tunnelmaker. It is très cool to see one client displaying an English menu, while at the same time a second client is displaying French.
However, if anyone reading this post has good knowledge of French, I would appreciate if they could critique my French translation file and provide corrections. I fear my level of French will never get past the read-only stage. The file, tunnelmaker.fr.tr, can be found in:
https://github.com/kestral246/tunnelmaker/tree/beta/locale
In addition, if anyone else would like the new tunnelmaker menu system to show up in their own language, I will accept other translation files. There is a template file, tunnelmaker.template, in the same above directory, which can be used as a reference to create them.
Here's what the new Tunnelmaker User Options menu looks like:

And here is a forum post that discusses how to do client-side translations:
https://forum.minetest.net/viewtopic.php?f=18&t=18349
Finally, I added better support for Android. It turns out that the Android version doesn't accept shift-left-click, so it was impossible to bring up the new menu. To fix this I added a second menu command, aux-right-click, which works on Android 5.0, since it now has an AUX button on the screen.