Emergo: first move can't be in center error message

Author: vanwamelen

locales/en/apgames.json

@@ -3888,6 +3888,7 @@
             "INITIAL_INSTRUCTIONS_play": "Select a stack with your piece on top to move.",
             "INVALID_MOVE_enter": "The move does not appear to be legal. You may not place a piece where it will induce a capture (feeding) unless your opponent is already required to capture.",
             "INVALID_MOVE_play": "The move does not appear to be legal. Capturing is compulsory, and you must capture the most pieces you can.",
+            "FIRST_MOVE": "The first move of the game can not be in the center",
             "VALID_PARTIAL": "Select a destination. Capturing is compulsory, and you must capture the most pieces you can.",
             "WHITE_SQUARE": "Pieces may only be placed on the dark squares."
         },

src/games/emergo.ts

@@ -416,6 +416,11 @@ export class EmergoGame extends GameBase {
                 result.message = i18next.t("apgames:validation.emergo.WHITE_SQUARE");
                 return result;
             }
+            if (this.currplayer === 1 && inhand[0] === 12 && cell === "e5") {
+                result.valid = false;
+                result.message = i18next.t("apgames:validation.emergo.FIRST_MOVE");
+                return result;
+            }
         }
         // otherwise move/capture
         else {