Allow multi-line messages

core/src/main/java/com/github/games647/fastlogin/core/shared/FastLoginCore.java

@@ -142,7 +142,7 @@ public class FastLoginCore<P extends C, C, T extends PlatformPlugin<C>> {
     public void sendLocaleMessage(String key, C receiver) {
         String message = localeMessages.get(key);
         if (message != null) {
-            plugin.sendMessage(receiver, message);
+            plugin.sendMultiLineMessage(receiver, message);
         }
     }
 

core/src/main/java/com/github/games647/fastlogin/core/shared/PlatformPlugin.java

@@ -15,6 +15,12 @@ public interface PlatformPlugin<C> {
 
     void sendMessage(C receiver, String message);
 
+    default void sendMultiLineMessage(C receiver, String message) {
+        for (String line : message.split("%nl%")) {
+            sendMessage(receiver, line);
+        }
+    }
+
     default ThreadFactory getThreadFactory() {
         return null;
     }