Add PlayerLocaleChangeEvent

src/main/java/com/destroystokyo/paper/event/player/PlayerLocaleChangeEvent.java

@@ -0,0 +1,47 @@
+package com.destroystokyo.paper.event.player;
+
+import org.bukkit.entity.Player;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.player.PlayerEvent;
+
+/**
+ * Called when the locale of the player is changed.
+ */
+public class PlayerLocaleChangeEvent extends PlayerEvent {
+    private static final HandlerList handlers = new HandlerList();
+    private final String oldLocale;
+    private final String newLocale;
+
+    public PlayerLocaleChangeEvent(final Player player, final String oldLocale, final String newLocale) {
+        super(player);
+        this.oldLocale = oldLocale;
+        this.newLocale = newLocale;
+    }
+
+    /**
+     * Gets the locale the player switched from.
+     *
+     * @return player's old locale
+     */
+    public String getOldLocale() {
+        return oldLocale;
+    }
+
+    /**
+     * Gets the locale the player is changed to.
+     *
+     * @return player's new locale
+     */
+    public String getNewLocale() {
+        return newLocale;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
+}