How could I find that out? It doesn't appear in the Ctrl-Space autocomplete menu, it's not in the documentation, and it doesn't appear in the error message that I can generate with a bad message name.
Yes. sorry about that. I'll have to fix this more urgently given the problem it appears to be causing. If you want autocomplete to work for a theme that extends another theme, comment out "extends = two" in your theme.
The system messages, I'll have to document fully in the documentation too. Thanks for letting me know how much this has inconvenienced you, and I promise to correct this.
The system was aimed at beginner level programmers, so I kind of purposefully omitted any features (like theming) that would possibly intimidate beginner level coders. I still choose to omit this from the side-panel documentation, but I'm treating the html documentation as the advanced documentation. It's still a work in progress and sometimes I dump information in chapter 9 as it's required. I'll reword the structure and order of things and move them into their own chapters later. Understanding the pain points is useful to make sure that the documentation is there to remove them.