Use locale for money format, closes #62

src/test/java/sh/okx/rankup/legacy/LegacyPlaceholderTest.java

@@ -1,6 +1,7 @@
 package sh.okx.rankup.legacy;
 
 import be.seeseemelk.mockbukkit.entity.PlayerMock;
+import java.text.DecimalFormat;
 import org.junit.Test;
 import sh.okx.rankup.RankupTest;
 
@@ -19,7 +20,8 @@ public class LegacyPlaceholderTest extends RankupTest {
     groupProvider.addGroup(player.getUniqueId(), "A");
     plugin.getHelper().rankup(player);
 
-    player.assertSaid("testPlayer A B A-display last rank 1,000 900 4 1 3 25 75");
+    DecimalFormat moneyFormat = new DecimalFormat("#,##0.##");
+    player.assertSaid("testPlayer A B A-display last rank " + moneyFormat.format(1_000) + " 900 4 1 3 25 75");
     player.assertNoMoreSaid();
   }
 }