Add per-locale language aliases

src/main/java/com/yourorg/servershop/ServerShopPlugin.java

@@ -7,6 +7,7 @@
 import com.yourorg.servershop.weekly.*;
 import com.yourorg.servershop.dynamic.*;
 import com.yourorg.servershop.config.*;
+import com.yourorg.servershop.lang.LanguageManager;
 import net.milkbowl.vault.economy.Economy;
 import org.bukkit.Bukkit;
 import org.bukkit.ChatColor;
@@ -22,6 +23,7 @@ public final class ServerShopPlugin extends JavaPlugin {
     private ShopService shopService;
     private DynamicPricingManager dynamic;
     private CategorySettings categorySettings;
+    private LanguageManager languageManager;
 
     @Override public void onEnable() {
         saveDefaultConfig();
@@ -39,6 +41,7 @@ public final class ServerShopPlugin extends JavaPlugin {
         this.dynamic = new DynamicPricingManager(this);
         this.shopService = new ShopService(this);
         this.menus = new MenuManager(this);
+        this.languageManager = new LanguageManager(this);
         Bukkit.getPluginManager().registerEvents(menus, this);
 
         int saveEvery = Math.max(1, getConfig().getInt("dynamicPricing.decay.saveEveryMinutes", 5));
@@ -79,4 +82,5 @@ public String prefixed(String msg) {
     public ShopService shop() { return shopService; }
     public DynamicPricingManager dynamic() { return dynamic; }
     public CategorySettings categorySettings() { return categorySettings; }
+    public LanguageManager lang() { return languageManager; }
 }

src/main/java/com/yourorg/servershop/commands/SellCommand.java

@@ -12,7 +12,7 @@ public final class SellCommand implements CommandExecutor {
     @Override public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
         if (!(sender instanceof Player p)) { sender.sendMessage(plugin.prefixed(plugin.getConfig().getString("messages.not-a-player"))); return true; }
         if (args.length < 2) { p.sendMessage(plugin.prefixed("/sell <material> <qty>")); return true; }
-        Material mat = Util.parseMaterial(args[1]);
+        Material mat = Util.parseMaterial(plugin, p, args[1]);
         int qty; try { qty = Math.max(1, Integer.parseInt(args.length > 2 ? args[2] : "1")); } catch (Exception e) { qty = 1; }
         if (mat == null) { p.sendMessage(plugin.prefixed(plugin.getConfig().getString("messages.unknown-material").replace("%material%", args[1]))); return true; }
         plugin.shop().sell(p, mat, qty).ifPresent(err -> p.sendMessage(plugin.prefixed(err)));

src/main/java/com/yourorg/servershop/commands/ShopCommand.java

@@ -25,6 +25,12 @@ public final class ShopCommand implements TabExecutor {
         if (args[0].equalsIgnoreCase("search")) return search(sender, args);
         if (args[0].equalsIgnoreCase("price")) return price(sender, args);
         if (args[0].equalsIgnoreCase("buy")) return buy(sender, args);
+        if (args[0].equalsIgnoreCase("lang")) {
+            if (!(sender instanceof Player p)) { sender.sendMessage(plugin.prefixed(plugin.getConfig().getString("messages.not-a-player"))); return true; }
+            String lang = plugin.lang().toggle(p);
+            p.sendMessage(plugin.prefixed("Language set to " + lang));
+            return true;
+        }
         sender.sendMessage(plugin.prefixed("Unknown subcommand."));
         return true;
     }
@@ -60,7 +66,7 @@ private boolean search(CommandSender sender, String[] args) {
 
     private boolean price(CommandSender sender, String[] args) {
         if (args.length < 2) { sender.sendMessage(plugin.prefixed("/shop price <material>")); return true; }
-        Material mat = Util.parseMaterial(args[1]);
+        Material mat = Util.parseMaterial(plugin, sender, args[1]);
         if (mat == null) { sender.sendMessage(plugin.prefixed(msg("unknown-material").replace("%material%", args[1]))); return true; }
         Optional<ItemEntry> opt = plugin.catalog().get(mat);
         if (opt.isEmpty() || !opt.get().canBuy()) { sender.sendMessage(plugin.prefixed(msg("not-for-sale").replace("%material%", mat.name()))); return true; }
@@ -73,7 +79,7 @@ private boolean buy(CommandSender sender, String[] args) {
         if (!(sender instanceof Player p)) { sender.sendMessage(plugin.prefixed(msg("not-a-player"))); return true; }
         if (plugin.economy() == null) { sender.sendMessage(plugin.prefixed(msg("no-economy"))); return true; }
         if (args.length < 3) { p.sendMessage(plugin.prefixed("/shop buy <material> <qty>")); return true; }
-        Material mat = Util.parseMaterial(args[1]);
+        Material mat = Util.parseMaterial(plugin, sender, args[1]);
         int qty; try { qty = Math.max(1, Integer.parseInt(args[2])); } catch (Exception ex) { qty = 1; }
         if (mat == null) { p.sendMessage(plugin.prefixed(msg("unknown-material").replace("%material%", args[1]))); return true; }
         plugin.shop().buy(p, mat, qty).ifPresent(err -> p.sendMessage(plugin.prefixed(err)));
@@ -84,7 +90,7 @@ private boolean buy(CommandSender sender, String[] args) {
 
     @Override public java.util.List<String> onTabComplete(CommandSender sender, Command cmd, String alias, String[] args) {
         java.util.List<String> out = new java.util.ArrayList<>();
-        if (args.length == 1) { suggest(out, args[0], "price","buy","search","admin"); return out; }
+        if (args.length == 1) { suggest(out, args[0], "price","buy","search","admin","lang"); return out; }
         if (args[0].equalsIgnoreCase("admin")) {
             if (args.length == 2) { suggest(out, args[1], "category","import","reload"); return out; }
             if (args[1].equalsIgnoreCase("category")) {

src/main/java/com/yourorg/servershop/commands/Util.java

@@ -1,10 +1,12 @@
 package com.yourorg.servershop.commands;
 
+import com.yourorg.servershop.ServerShopPlugin;
 import org.bukkit.Material;
+import org.bukkit.command.CommandSender;
 
 public final class Util {
-    public static Material parseMaterial(String raw) {
-        if (raw == null) return null;
-        return Material.matchMaterial(raw.toUpperCase().replace('-', '_').replace(' ', '_'));
+    public static Material parseMaterial(ServerShopPlugin plugin, CommandSender sender, String raw) {
+        if (plugin == null) return null;
+        return plugin.lang().parseMaterial(sender, raw);
     }
 }

src/main/java/com/yourorg/servershop/lang/LanguageManager.java

@@ -0,0 +1,104 @@
+package com.yourorg.servershop.lang;
+
+import com.yourorg.servershop.ServerShopPlugin;
+import org.bukkit.Material;
+import org.bukkit.command.CommandSender;
+import org.bukkit.entity.Player;
+import org.bukkit.configuration.file.YamlConfiguration;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.*;
+
+public final class LanguageManager {
+    private final ServerShopPlugin plugin;
+    private final Map<String, Map<String, Material>> aliases = new HashMap<>();
+    private final Map<UUID, String> playerLang = new HashMap<>();
+    private final java.util.List<String> languages = new ArrayList<>();
+
+    public LanguageManager(ServerShopPlugin plugin) {
+        this.plugin = plugin;
+        // ensure default resources exist
+        plugin.saveResource("aliases-en.yml", false);
+        plugin.saveResource("aliases-de.yml", false);
+        loadAliases();
+        loadPlayers();
+    }
+
+    private void loadAliases() {
+        aliases.clear();
+        languages.clear();
+        File folder = plugin.getDataFolder();
+        File[] files = folder.listFiles(f -> f.getName().startsWith("aliases-") && f.getName().endsWith(".yml"));
+        if (files == null) return;
+        for (File f : files) {
+            String name = f.getName();
+            String lang = name.substring("aliases-".length(), name.length() - 4).toLowerCase(Locale.ROOT);
+            YamlConfiguration y = YamlConfiguration.loadConfiguration(f);
+            Map<String, Material> map = new HashMap<>();
+            for (String key : y.getKeys(false)) {
+                String matName = y.getString(key);
+                if (matName == null) continue;
+                Material m = Material.matchMaterial(matName.toUpperCase(Locale.ROOT).replace(' ', '_').replace('-', '_'));
+                if (m != null) map.put(key.toLowerCase(Locale.ROOT).replace('-', ' ').replace('_', ' '), m);
+            }
+            aliases.put(lang, map);
+            languages.add(lang);
+        }
+    }
+
+    private void loadPlayers() {
+        playerLang.clear();
+        File f = new File(plugin.getDataFolder(), "lang.yml");
+        YamlConfiguration y = YamlConfiguration.loadConfiguration(f);
+        for (String key : y.getKeys(false)) {
+            try {
+                UUID id = UUID.fromString(key);
+                String lang = y.getString(key, "en");
+                playerLang.put(id, lang);
+            } catch (IllegalArgumentException ignored) {}
+        }
+    }
+
+    private void savePlayers() {
+        File f = new File(plugin.getDataFolder(), "lang.yml");
+        YamlConfiguration y = new YamlConfiguration();
+        for (Map.Entry<UUID, String> e : playerLang.entrySet()) {
+            y.set(e.getKey().toString(), e.getValue());
+        }
+        try { y.save(f); } catch (IOException ignored) {}
+    }
+
+    public Material parseMaterial(CommandSender sender, String raw) {
+        if (raw == null) return null;
+        String norm = raw.toLowerCase(Locale.ROOT).replace('-', ' ').replace('_', ' ');
+        if (sender instanceof Player p) {
+            String lang = playerLang.get(p.getUniqueId());
+            if (lang != null) {
+                Material m = match(lang, norm);
+                if (m != null) return m;
+            }
+        }
+        for (String lang : languages) {
+            Material m = match(lang, norm);
+            if (m != null) return m;
+        }
+        return Material.matchMaterial(raw.toUpperCase(Locale.ROOT).replace('-', '_').replace(' ', '_'));
+    }
+
+    private Material match(String lang, String norm) {
+        Map<String, Material> map = aliases.get(lang);
+        if (map == null) return null;
+        return map.get(norm);
+    }
+
+    public String toggle(Player p) {
+        if (languages.isEmpty()) return "en";
+        String cur = playerLang.getOrDefault(p.getUniqueId(), languages.get(0));
+        int idx = languages.indexOf(cur);
+        String next = languages.get((idx + 1) % languages.size());
+        playerLang.put(p.getUniqueId(), next);
+        savePlayers();
+        return next;
+    }
+}

src/main/resources/aliases-de.yml

@@ -0,0 +1,2 @@
+# German item aliases
+eisenbarren: IRON_INGOT

src/main/resources/aliases-en.yml

@@ -0,0 +1,2 @@
+# English item aliases
+iron ingot: IRON_INGOT