- do not use M_EPI1 and M_EPI2 in any Doom 2 context.

Their content is inconsistent across versions, so better always use the text version of the names.

wadsrc/static/mapinfo/doom2bfg.txt

@@ -10,14 +10,12 @@ clearepisodes
 episode map01
 {
 	name = "$TXT_D2E1"
-	picname = "M_EPI1"
 	key = "h"
 }
 
 episode level01
 {
 	name = "$TXT_D2E2"
-	picname = "M_EPI2"
 	key = "n"
 	optional
 }

wadsrc/static/mapinfo/doom2unity.txt

@@ -10,7 +10,6 @@ clearepisodes
 episode map01
 {
 	name = "$TXT_D2E1"
-	picname = "M_EPI1"
 	key = "h"
 }
 

wadsrc/static/mapinfo/doom2xbox.txt

@@ -5,14 +5,12 @@ clearepisodes
 episode map01
 {
 	name = "$TXT_D2E1"
-	picname = "M_EPI1"
 	key = "h"
 }
 
 episode level01
 {
 	name = "$TXT_D2E2"
-	picname = "M_EPI2"
 	key = "n"
 	optional
 }