vl-decl(-1st)/test

I told you, my knowledge of templates is crude. I dun know exactly what an Lua module is, or how to create one. And am not sure what you mean by parameters. Are talking about the digits sandwiched with braces?

Yes, those. A Lua module is like Module:nl-verb.

That code reads like Chinese to me.

It is much more powerful than templates though, and faster too. It can look inside text and search for or replace individual characters. So it could also strip out acute accents and underdots from accented Vulgar Latin forms, which a template can't do.

Templates are cryptic enough as it is. Spending frustrated weeks trying to learn complicated programming does not rank high on my priority list. Just delete the template that I made, and consider making a module.