Fix Java 8 Properties

SpigotCore_Main/src/de/steamwar/message/Message.java

@@ -20,6 +20,7 @@
 package de.steamwar.message;
 
 import de.steamwar.core.BountifulWrapper;
+import de.steamwar.core.Core;
 import de.steamwar.sql.SteamwarUser;
 import net.md_5.bungee.api.ChatMessageType;
 import net.md_5.bungee.api.chat.ClickEvent;
@@ -35,9 +36,6 @@ import java.util.Locale;
 import java.util.ResourceBundle;
 
 public class Message {
-
-    private static final int JDK_VERSION = Integer.parseInt(System.getProperty("java.version").split("\\.")[1]);
-
     private final String resourceBundleName;
     private final ClassLoader classLoader;
 
@@ -78,7 +76,7 @@ public class Message {
 
     private String fromRB(ResourceBundle bundle, String key) {
         String result = bundle.getString(key);
-        if(JDK_VERSION < 9)
+        if(Core.getVersion() < 12)
             result = new String(result.getBytes(StandardCharsets.ISO_8859_1), StandardCharsets.UTF_8);
         return result;
     }