Hello! I noticed two comments from users asking how to fix this issue, I used to play on Mac and thought I'd leave this thread here in case it can help anyone.

Mods with custom fonts do not work on Mac: any Warband mod that uses a custom font will completely lack text when played on Mac. Thankfully custom fonts exist in a single easily-accessible file, and if it is deleted the game will use the default, functional font. This fix works for all mods that use a custom font.

To fix:
1. Navigate to Steam/steamapps/workshop/content/48700/3433617278/Textures
2. Find and delete the file "font.dds"

That's all! Launch the mod and the problem should be fixed.

For some reason when I search "font" and "font.dds" in my file explorer the file doesn't come up, but when I sort the files alphabetically and scroll down manually it's there.

For anyone wondering, workshop/content/48700 is the folder containing Warband mods downloaded from the workshop. 3433617278 is the folder for Realistic Calradia.