I haven't found the code that's doing this yet, but I will submit a fix in a PR once I find it and fix it.
Things like this will not capitalize the first letter when links are enabled : msg("{nm:item:the:true}: You can't take it because it's a landform.")
Without links:
The mountain: You can't take it because it's a landform.
With links:
the mountain: You can't take it because it's a landform.
From what I see in the links code, there is no way to pass a string to use here. It simply uses the item's alias. I just need to find the code in the nm command that concerns the links, though. More on this as it comes in...