Add hard mapping to convert to AuthMe language code from locale code

src/main/java/fr/xephi/authme/message/AbstractMessageFileHandler.java

@@ -8,12 +8,14 @@ import fr.xephi.authme.output.ConsoleLoggerFactory;
 import fr.xephi.authme.settings.Settings;
 import fr.xephi.authme.settings.properties.PluginSettings;
 import fr.xephi.authme.util.FileUtils;
+import fr.xephi.authme.util.PlayerUtils;
 import org.bukkit.configuration.file.FileConfiguration;
 import org.bukkit.configuration.file.YamlConfiguration;
 
 import javax.annotation.PostConstruct;
 import javax.inject.Inject;
 import java.io.File;
+import java.util.Map;
 import java.util.concurrent.ConcurrentHashMap;
 
 import static fr.xephi.authme.message.MessagePathHelper.DEFAULT_LANGUAGE;
@@ -34,7 +36,7 @@ public abstract class AbstractMessageFileHandler implements Reloadable {
 
     private String filename;
     private FileConfiguration configuration;
-    private ConcurrentHashMap<String, FileConfiguration> i18nConfiguration;
+    private Map<String, FileConfiguration> i18nConfiguration;
     private final String defaultFile;
 
     protected AbstractMessageFileHandler() {
@@ -120,6 +122,8 @@ public abstract class AbstractMessageFileHandler implements Reloadable {
             i18nConfiguration = new ConcurrentHashMap<>();
         }
 
+        locale = PlayerUtils.LocaleToCode(locale, settings);
+
         if (i18nConfiguration.containsKey(locale)) {
             return i18nConfiguration.get(locale);
         } else {

src/main/java/fr/xephi/authme/util/PlayerUtils.java

@@ -1,5 +1,7 @@
 package fr.xephi.authme.util;
 
+import fr.xephi.authme.settings.Settings;
+import fr.xephi.authme.settings.properties.PluginSettings;
 import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 
@@ -65,4 +67,100 @@ public final class PlayerUtils {
 
         return locale;
     }
+
+    /**
+     * Returns the AuthMe messages file language code, by given locale and settings.
+     * Dreeam - Hard mapping, based on mc1.20.6, 5/29/2024
+     *
+     * @param locale The locale that player client setting uses.
+     * @param settings The AuthMe settings, for default/fallback language usage.
+     */
+    public static String LocaleToCode(String locale, Settings settings) {
+        locale = locale.toLowerCase();
+
+        switch (locale) {
+            case "pt_br":
+                return "br";
+            case "cs_cz":
+                return "cz";
+            case "lzh":
+            case "zh_cn":
+                return "zhcn";
+            case "zh_hk":
+                return "zhhk";
+            case "zh_tw":
+                return "zhtw";
+        }
+
+        if (locale.contains("_")) {
+            locale = locale.substring(0, locale.indexOf("_"));
+        }
+
+        switch (locale) {
+            case "en":
+                return "en";
+            case "bg":
+                return "bg";
+            case "de":
+            case "nds":
+            case "sxu":
+            case "swg":
+                return "de";
+            case "eo":
+                return "eo";
+            case "es":
+                return "es";
+            case "et":
+                return "et";
+            case "eu":
+                return "eu";
+            case "fi":
+                return "fi";
+            case "fr":
+                return "fr";
+            case "gl":
+                return "gl";
+            case "hu":
+                return "hu";
+            case "id":
+                return "id";
+            case "it":
+                return "it";
+            case "ja":
+                return "ja";
+            case "ko":
+                return "ko";
+            case "lt":
+                return "lt";
+            case "nl":
+                return "nl";
+            case "pl":
+                return "pl";
+            case "pt":
+                return "pt";
+            case "ro":
+                return "ro";
+            case "ru":
+            case "rpr":
+                return "ru";
+            case "sl":
+                return "si";
+            case "sk":
+                return "sk";
+            case "sr":
+                return "sr";
+            case "tr":
+                return "tr";
+            case "uk":
+                return "uk";
+            case "vi":
+                return "vn";
+            case "lzh":
+                return "zhcn";
+            //case "zhmc":
+            //    return "zhmc";
+            default:
+                return settings.getProperty(PluginSettings.MESSAGES_LANGUAGE);
+        }
+    }
 }