it is done

core/src/mindustry/ui/IntFormat.java

@@ -0,0 +1,33 @@
+package mindustry.ui;
+
+
+import arc.Core;
+import arc.func.Func;
+
+/**
+ * A low-garbage way to format bundle strings.
+ */
+public class IntFormat{
+    private final StringBuilder builder = new StringBuilder();
+    private final String text;
+    private int lastValue = Integer.MIN_VALUE;
+    private Func<Integer, String> converter = String::valueOf;
+
+    public IntFormat(String text){
+        this.text = text;
+    }
+
+    public IntFormat(String text, Func<Integer, String> converter){
+        this.text = text;
+        this.converter = converter;
+    }
+
+    public CharSequence get(int value){
+        if(lastValue != value){
+            builder.setLength(0);
+            builder.append(Core.bundle.format(text, converter.get(value)));
+        }
+        lastValue = value;
+        return builder;
+    }
+}