Disable Japanese L4 until the translation is done

jp/index.ts

@@ -53,7 +53,7 @@ import l3_ch11 from './3/11-savinggasstorage.md'
 import l3_ch12 from './3/12-forloops.md'
 import l3_ch13 from './3/13-wrappingitup.md'
 import l3_complete from './3/14-lessoncomplete.md'
-
+/*
 // lesson4
 import l4_overview from './4/00-overview.md'
 import l4_payable from './4/payable.md'
@@ -69,7 +69,7 @@ import l4_ch8 from './4/battle-08.md'
 import l4_ch9 from './4/battle-09.md'
 import l4_ch10 from './4/wrappingitup.md'
 import l4_complete from './4/lessoncomplete.md'
-
+*/
 // chapterList is an ordered array of chapters. The order represents the order of the chapters.
 // chapter index will be 1-based and not zero-based. First chapter is 1
 
@@ -126,7 +126,7 @@ export default {
     l3_ch12,
     l3_ch13,
     l3_complete
-  ],
+  ]/*,
   4: [
     l4_overview,
     l4_payable,
@@ -142,5 +142,5 @@ export default {
     l4_ch9,
     l4_ch10,
     l4_complete
-  ]
+  ]*/
 }