Fixing the "Missing String" diplomacy problem when adding new cultures

I have been modding for about 11 years, but I have encountered a problem.

I have created new "Cultures" for certain factions, in order to give them faction specific campaign map models. This has worked fine. The problem is that I am now getting "Missing String" messages in diplomacy for those factions.

I used to know how to resolve this years ago but have forgotten.

How is this issue resolved?

Thanks in advance.

I don't know if contains the answer (and you have probably already found the tutorial), but uanime's tutorial on creating cultures might help - maybe there's something in the checklist that you didn't do?

Thanks Alwyn. I've had a look since I saw your reply but so far I don't see the issue mentioned there. I have posted a question on this on uanime5s thread.