[1.14+] Fix "Player Overview" title

We used to remap the old language key layout for inputs to the one used by
fabric but didn't consider that we might still be directly referencing the old
key somewhere else (e.g. for the Player Overview title).

With this commit, we retain the original and add the new mapping.

src/main/java/com/replaymod/core/versions/LangResourcePack.java

@@ -37,7 +37,7 @@ import java.util.stream.Collectors;
 
 /**
  * Resource pack which on-the-fly converts pre-1.13 language files into 1.13 json format.
- * Also remaps `replaymod.input.*` bindings to `key.replaymod.*` as convention on Fabric.
+ * Also duplicates `replaymod.input.*` bindings to `key.replaymod.*` as convention on Fabric.
  */
 public class LangResourcePack extends AbstractFileResourcePack {
     private static final Gson GSON = new Gson();
@@ -120,6 +120,8 @@ public class LangResourcePack extends AbstractFileResourcePack {
             value = convertValue(value);
             //#if MC>=11400
             if (key.startsWith(LEGACY_KEY_PREFIX)) {
+                // Duplicating instead of just remapping as some other part of the UI may still rely on the old key
+                properties.put(key, value);
                 key = String.format(FABRIC_KEY_FORMAT, key.substring(LEGACY_KEY_PREFIX.length()));
             }
             //#endif