forgot a translation

Author: Lyof429

src/main/resources/assets/infernalexp/lang/en_us.json

@@ -12,6 +12,7 @@
   "block.infernalexp.dullstone": "Dullstone",
   "block.infernalexp.polished_dullstone": "Polished Dullstone",
   "block.infernalexp.glowsilk_cocoon": "Glowsilk Cocoon",
+  "block.infernalexp.luminous_fungus": "Luminous Fungus",
 
   "item.infernalexp.dullrocks": "Dullrocks",
   "item.infernalexp.tab_icon": "Infernal Expansion"