Interface size setting: auto, large, medium or small on the world's pixel grid

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

lang/fi.lang

@@ -264,6 +264,8 @@ val.medium = Keski
 val.high = Korkea
 val.normal = Normaali
 val.large = Suuri
+val.small = Pieni
+val.auto_plain = Automaattinen
 
 # ---- key binding names
 key.cam_forward = Kamera eteen