Add basic locale support.

src/main/java/com/onarandombox/MultiverseCore/commands/DebugCommand.java

@@ -1,5 +1,6 @@
 package com.onarandombox.MultiverseCore.commands;
 
+import co.aikar.commands.CommandIssuer;
 import co.aikar.commands.annotation.CommandAlias;
 import co.aikar.commands.annotation.CommandCompletion;
 import co.aikar.commands.annotation.CommandPermission;
@@ -9,6 +10,7 @@ import co.aikar.commands.annotation.Subcommand;
 import co.aikar.commands.annotation.Syntax;
 import com.dumptruckman.minecraft.util.Logging;
 import com.onarandombox.MultiverseCore.MultiverseCore;
+import com.onarandombox.MultiverseCore.messaging.CoreMessageKeys;
 import org.bukkit.ChatColor;
 import org.bukkit.command.CommandSender;
 import org.jetbrains.annotations.NotNull;
@@ -22,35 +24,35 @@ public class DebugCommand extends MultiverseCoreCommand {
 
     @Subcommand("debug")
     @CommandPermission("multiverse.core.debug")
-    @Description("Show the current debug level.")
+    @Description("{@@mv-core.debug_info_description}")
-    public void onShowDebugCommand(@NotNull CommandSender sender) {
+    public void onShowDebugCommand(@NotNull CommandIssuer issuer) {
-        this.displayDebugMode(sender);
+        this.displayDebugMode(issuer);
     }
 
     @Subcommand("debug")
     @CommandPermission("multiverse.core.debug")
-    @Syntax("<level>")
+    @Syntax("<{@@mv-core.debug_change_syntax}>")
-    @CommandCompletion("@toggles|@range:3")
+    @CommandCompletion("@range:3")
-    @Description("Change debug level.")
+    @Description("{@@mv-core.debug_change_description}")
-    public void onChangeDebugCommand(@NotNull CommandSender sender,
+    public void onChangeDebugCommand(@NotNull CommandIssuer issuer,
 
                                      @Conditions("debuglevel")
-                                     @Syntax("<level>")
+                                     @Syntax("<{@@mv-core.debug_change_syntax}>")
-                                     @Description("Debug level to set to.")
+                                     @Description("{@@mv-core.debug_change_level_description}")
                                      int level) {
 
         this.plugin.getMVConfig().setGlobalDebug(level);
-        this.saveMVConfigs(sender);
+        this.saveMVConfigs(issuer);
-        this.displayDebugMode(sender);
+        this.displayDebugMode(issuer);
     }
 
-    private void displayDebugMode(@NotNull CommandSender sender) {
+    private void displayDebugMode(@NotNull CommandIssuer issuer) {
         final int debugLevel = this.plugin.getMVConfig().getGlobalDebug();
         if (debugLevel == 0) {
-            sender.sendMessage("Multiverse Debug mode is " + ChatColor.RED + "OFF");
+            issuer.sendInfo(CoreMessageKeys.DEBUG_INFO_OFF);
             return;
         }
-        sender.sendMessage("Multiverse Debug mode is at level " + ChatColor.GREEN + debugLevel);
+        issuer.sendInfo(CoreMessageKeys.DEBUG_INFO_ON, "{level}", String.valueOf(debugLevel));
-        Logging.fine("Multiverse Debug ENABLED");
+        Logging.fine("Multiverse Debug ENABLED.");
     }
 }

src/main/java/com/onarandombox/MultiverseCore/commands/MultiverseCoreCommand.java

@@ -1,9 +1,9 @@
 package com.onarandombox.MultiverseCore.commands;
 
+import co.aikar.commands.CommandIssuer;
 import com.onarandombox.MultiverseCore.MultiverseCore;
 import com.onarandombox.MultiverseCore.commandtools.MultiverseCommand;
-import org.bukkit.ChatColor;
+import com.onarandombox.MultiverseCore.messaging.CoreMessageKeys;
-import org.bukkit.command.CommandSender;
 
 /**
  * Generic multiverse core command with handy reference to the plugin instance.
@@ -16,12 +16,11 @@ public abstract class MultiverseCoreCommand extends MultiverseCommand {
         this.plugin = plugin;
     }
 
-    protected boolean saveMVConfigs(CommandSender sender) {
+    protected boolean saveMVConfigs(CommandIssuer issuer) {
         if (this.plugin.saveMVConfigs()) {
             return true;
         }
-        sender.sendMessage(ChatColor.RED + "An error occurred while trying to save Multiverse-Core config.yml. " +
+        issuer.sendError(CoreMessageKeys.CONFIG_SAVE_FAILED);
-                "You changes will be temporary!");
         return false;
     }
 }

src/main/java/com/onarandombox/MultiverseCore/commandtools/MVCommandManager.java

@@ -9,6 +9,8 @@ import co.aikar.commands.PaperCommandManager;
 import com.onarandombox.MultiverseCore.MultiverseCore;
 import com.onarandombox.MultiverseCore.commands.DebugCommand;
 
+import java.util.Locale;
+
 /**
  * Main class to manage permissions.
  */
@@ -20,6 +22,11 @@ public class MVCommandManager extends PaperCommandManager {
         super(plugin);
         this.plugin = plugin;
 
+        // Setup locale
+        this.addSupportedLanguage(Locale.ENGLISH);
+        this.locales.addMessageBundles("multiverse-core");
+        this.locales.loadLanguages();
+
         // Register commands
         this.registerCommand(new DebugCommand(plugin));
     }

src/main/java/com/onarandombox/MultiverseCore/messaging/CoreMessageKeys.java

@@ -0,0 +1,20 @@
+package com.onarandombox.MultiverseCore.messaging;
+
+import co.aikar.locales.MessageKey;
+import co.aikar.locales.MessageKeyProvider;
+
+import java.util.Locale;
+
+public enum CoreMessageKeys implements MessageKeyProvider {
+
+    CONFIG_SAVE_FAILED,
+    DEBUG_INFO_OFF,
+    DEBUG_INFO_ON;
+
+    private final MessageKey key = MessageKey.of("mv-core." + this.name().toLowerCase(Locale.ENGLISH));
+
+    @Override
+    public MessageKey getMessageKey() {
+        return this.key;
+    }
+}

src/main/resources/multiverse-core_en.properties

@@ -0,0 +1,7 @@
+mv-core.config_save_failed=§cUnable to save Multiverse-Core config.yml. Your changes will be temporary!
+mv-core.debug_info_description=Show the current debug level.
+mv-core.debug_info_off=§fMultiverse Debug mode is §cOFF§f.
+mv-core.debug_info_on=§fMultiverse Debug mode is at §alevel {level}§f.
+mv-core.debug_change_description=Change debug level.
+mv-core.debug_change_syntax=level
+mv-core.debug_change_level_description=Debug level to set to.