Make the default permission message configurable

paper-api/src/main/java/org/bukkit/Bukkit.java

@@ -2445,6 +2445,28 @@ public final class Bukkit {
         return server.suggestPlayerNamesWhenNullTabCompletions();
     }
 
+    /**
+     * Gets the default no permission message used on the server
+     *
+     * @return the default message
+     * @deprecated use {@link #permissionMessage()}
+     */
+    @NotNull
+    @Deprecated
+    public static String getPermissionMessage() {
+        return server.getPermissionMessage();
+    }
+
+    /**
+     * Gets the default no permission message used on the server
+     *
+     * @return the default message
+     */
+    @NotNull
+    public static net.kyori.adventure.text.Component permissionMessage() {
+        return server.permissionMessage();
+    }
+
     /**
      * Creates a PlayerProfile for the specified uuid, with name as null.
      *

paper-api/src/main/java/org/bukkit/Server.java

@@ -2127,6 +2127,23 @@ public interface Server extends PluginMessageRecipient, net.kyori.adventure.audi
      */
     boolean suggestPlayerNamesWhenNullTabCompletions();
 
+    /**
+     * Gets the default no permission message used on the server
+     *
+     * @return the default message
+     * @deprecated use {@link #permissionMessage()}
+     */
+    @NotNull
+    @Deprecated
+    String getPermissionMessage();
+
+    /**
+     * Gets the default no permission message used on the server
+     *
+     * @return the default message
+     */
+    @NotNull net.kyori.adventure.text.Component permissionMessage();
+
     /**
      * Creates a PlayerProfile for the specified uuid, with name as null.
      *

paper-api/src/main/java/org/bukkit/command/Command.java

@@ -192,10 +192,9 @@ public abstract class Command {
             return true;
         }
 
-        if (permissionMessage == null) {
-            target.sendMessage(ChatColor.RED + "I'm sorry, but you do not have permission to perform this command. Please contact the server administrators if you believe that this is a mistake.");
             // Paper start - use components for permissionMessage
-        } else if (!permissionMessage.equals(net.kyori.adventure.text.Component.empty())) {
+        net.kyori.adventure.text.Component permissionMessage = this.permissionMessage != null ? this.permissionMessage : Bukkit.permissionMessage();
+        if (!permissionMessage.equals(net.kyori.adventure.text.Component.empty())) {
             target.sendMessage(permissionMessage.replaceText(net.kyori.adventure.text.TextReplacementConfig.builder().matchLiteral("<permission>").replacement(permission).build()));
             // Paper end
         }