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/en.lang

@@ -264,6 +264,8 @@ val.medium = Medium
 val.high = High
 val.normal = Normal
 val.large = Large
+val.small = Small
+val.auto_plain = Auto
 
 # ---- key binding names
 key.cam_forward = Camera forward