src/main/java/dev/marcospaulo/canalhandia/Canalhandia.java

@@ -5,6 +5,7 @@ import net.kyori.adventure.text.event.ClickEvent;
 import net.kyori.adventure.text.format.NamedTextColor;
 import net.kyori.adventure.text.format.TextDecoration;
 import net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer;
+import net.kyori.adventure.translation.TranslationStore;
 import org.bukkit.Bukkit;
 import org.bukkit.GameRule;
 import org.bukkit.Location;
@@ -99,6 +100,7 @@ public final class Canalhandia extends JavaPlugin implements Listener {
     private Poll poll;
     private Titles titles;
     private DeathGift deathGift;
+    private TranslationStore<?> i18n;
 
     @Override
     public void onEnable() {
@@ -106,6 +108,7 @@ public final class Canalhandia extends JavaPlugin implements Listener {
         // Ship the editable catalogues; false = never overwrite the operator's copy.
         saveResource("conquistas-catalogo.yml", false);
         saveResource("marcos-catalogo.yml", false);
+        i18n = I18n.install(i18n, getLogger());
         settings = new Settings(this);
         notes = new Notes(new java.io.File(getDataFolder(), "notas.yml"));
         mail = new Mail(new java.io.File(getDataFolder(), "recados.yml"));
@@ -252,6 +255,11 @@ public final class Canalhandia extends JavaPlugin implements Listener {
         deathGift.reload();
     }
 
+    /** Reloads the i18n bundles from the jar and re-registers the translator. */
+    void reloadI18n() {
+        i18n = I18n.install(i18n, getLogger());
+    }
+
     /** The weekly ranking baseline. Never null. */
     WeeklyStats weeklyStats() {
         return weeklyStats;
@@ -775,11 +783,12 @@ public final class Canalhandia extends JavaPlugin implements Listener {
                 button = button.clickEvent(ClickEvent.runCommand(
                         "/canalhandia reagir " + mourning.id() + " f"));
             }
+            Component prompt = Lang.tr(bedrock
+                            ? "canalhandia.morte.luto.digitar"
+                            : "canalhandia.morte.luto.prestar",
+                    Component.text(name));
             return Component.text("             ").append(button)
-                    .append(Component.text(bedrock
-                                    ? "digite /f para prestar luto por " + name
-                                    : "prestar luto por " + name,
-                            NamedTextColor.GRAY));
+                    .append(prompt.color(NamedTextColor.GRAY));
         }), 2L);
 
         getServer().getScheduler().runTaskLater(this, () -> {
@@ -789,9 +798,10 @@ public final class Canalhandia extends JavaPlugin implements Listener {
                 int shown = Math.min(who.size(), settings.summaryNames());
                 String text = String.join(", ", who.subList(0, shown))
                         + (who.size() > shown ? " +" + (who.size() - shown) : "");
+                Component summary = Lang.tr("canalhandia.morte.luto.resumo",
+                        Component.text(text), Component.text(name));
                 Bukkit.broadcast(Component.text("             ")
-                        .append(Component.text(text + " prestaram luto por " + name + ".",
-                                NamedTextColor.GRAY)));
+                        .append(summary.color(NamedTextColor.GRAY)));
             }
             if (liveReactions == mourning) {
                 liveReactions = null;

src/main/java/dev/marcospaulo/canalhandia/CanalhandiaCommand.java

@@ -107,6 +107,7 @@ final class CanalhandiaCommand implements CommandExecutor, TabCompleter {
                 if (admin(sender)) {
                     plugin.reloadConfig();
                     plugin.reloadCatalogo();
+                    plugin.reloadI18n();
                     plugin.rescheduleTimer();
                     plugin.rescheduleMilestones();
                     Msg.ok(sender, "Recarregado: " + Achievement.values().length

src/main/java/dev/marcospaulo/canalhandia/I18n.java

@@ -0,0 +1,77 @@
+package dev.marcospaulo.canalhandia;
+
+import net.kyori.adventure.key.Key;
+import net.kyori.adventure.translation.GlobalTranslator;
+import net.kyori.adventure.translation.TranslationStore;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.util.Locale;
+import java.util.PropertyResourceBundle;
+import java.util.ResourceBundle;
+import java.util.logging.Logger;
+
+/**
+ * i18n: registers an Adventure {@link TranslationStore} (key
+ * {@code canalhandia}) into the {@link GlobalTranslator}, populated from the
+ * bundled {@code lang/messages_pt.properties} (source of truth) and
+ * {@code lang/messages_en.properties}.
+ *
+ * <p>Per-viewer rendering is automatic: Paper runs every component sent to an
+ * audience through the {@code GlobalTranslator} in the viewer's own locale, so
+ * one broadcast shows each player their own language. No per-player lookup.
+ *
+ * <p>Language resolution: registry default is {@code en} (the base bundle).
+ * {@code pt} and {@code pt_BR} fall back to the PT bundle; the store does the
+ * locale fallback, unknown locales hit the default. That's the whole rule.
+ */
+final class I18n {
+
+    static final Key SOURCE = Key.key("canalhandia");
+    static final Locale DEFAULT = Locale.ENGLISH;
+    /** Escape single quotes so MessageFormat does not swallow apostrophes. */
+    private static final boolean ESCAPE_QUOTES = true;
+    private static final String PT = "lang/messages_pt.properties";
+    private static final String EN = "lang/messages_en.properties";
+
+    private I18n() {
+    }
+
+    /**
+     * Loads both bundles and registers the store with the global translator.
+     * Removes any previously registered store first, so {@code /canalhandia
+     * reload} does not stack sources.
+     */
+    static TranslationStore<?> install(TranslationStore<?> previous, Logger logger) {
+        if (previous != null) {
+            GlobalTranslator.translator().removeSource(previous);
+        }
+        TranslationStore.StringBased<java.text.MessageFormat> store = TranslationStore.messageFormat(SOURCE);
+        store.defaultLocale(DEFAULT);
+        load(EN, store, Locale.ENGLISH, logger);
+        load(PT, store, Locale.of("pt"), logger);
+        GlobalTranslator.translator().addSource(store);
+        return store;
+    }
+
+    private static void load(String resource,
+                            TranslationStore.StringBased<java.text.MessageFormat> store,
+                            Locale locale, Logger logger) {
+        try (InputStream in = I18n.class.getClassLoader().getResourceAsStream(resource)) {
+            if (in == null) {
+                logger.warning("i18n: recurso ausente: " + resource);
+                return;
+            }
+            // PropertyResourceBundle(Reader) honours the reader's encoding; the
+            // InputStream constructor is fixed to ISO-8859-1 and would mojibake
+            // the PT accents.
+            ResourceBundle bundle = new PropertyResourceBundle(
+                    new InputStreamReader(in, StandardCharsets.UTF_8));
+            store.registerAll(locale, bundle, ESCAPE_QUOTES);
+        } catch (IOException e) {
+            logger.warning("i18n: falha ao carregar " + resource + ": " + e.getMessage());
+        }
+    }
+}

src/main/java/dev/marcospaulo/canalhandia/Lang.java

@@ -0,0 +1,21 @@
+package dev.marcospaulo.canalhandia;
+
+import net.kyori.adventure.text.Component;
+
+/**
+ * Terse facade over {@link Component#translatable} so call sites read as i18n
+ * rather than as an Adventure call: {@code Lang.tr("canalhandia.morte.luto.prestar", name)}.
+ *
+ * <p>The key is rendered per-viewer by the {@link GlobalTranslator} source that
+ * {@link I18n} registers; args are inserted by {@code MessageFormat} ({@code {0}},
+ * {@code {1}}, …).
+ */
+final class Lang {
+
+    private Lang() {
+    }
+
+    static Component tr(String key, Component... args) {
+        return Component.translatable(key, args);
+    }
+}

src/main/resources/lang/messages_en.properties

@@ -0,0 +1,7 @@
+# Canalhandia — English (translated from messages_pt.properties).
+# Never alter {0}/{1} placeholders or MiniMessage <...> tags.
+
+# Mourning (Canalhandia.onDeath) — F button under each death message.
+canalhandia.morte.luto.prestar=pay respects for {0}
+canalhandia.morte.luto.digitar=type /f to pay respects for {0}
+canalhandia.morte.luto.resumo={0} paid respects for {1}.

src/main/resources/lang/messages_pt.properties

@@ -0,0 +1,7 @@
+# Canalhandia — portugues (fonte de verdade). Padroes MessageFormat: {0}, {1}, ...
+# NUNCA altere os placeholders {0}/{1} nem as tags MiniMessage <...>.
+
+# Luto (Canalhandia.onDeath) — botao F sob cada mensagem de morte.
+canalhandia.morte.luto.prestar=prestar luto por {0}
+canalhandia.morte.luto.digitar=digite /f para prestar luto por {0}
+canalhandia.morte.luto.resumo={0} prestaram luto por {1}.

src/test/java/dev/marcospaulo/canalhandia/I18nTest.java

@@ -0,0 +1,109 @@
+package dev.marcospaulo.canalhandia;
+
+import net.kyori.adventure.key.Key;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.serializer.plain.PlainTextComponentSerializer;
+import net.kyori.adventure.translation.GlobalTranslator;
+import net.kyori.adventure.translation.TranslationStore;
+import org.junit.jupiter.api.AfterEach;
+import org.junit.jupiter.api.BeforeEach;
+import org.junit.jupiter.api.Test;
+
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.nio.charset.StandardCharsets;
+import java.text.MessageFormat;
+import java.util.Locale;
+import java.util.PropertyResourceBundle;
+import java.util.ResourceBundle;
+import java.util.TreeSet;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertNotNull;
+
+/**
+ * The two contracts the i18n bundles must hold: identical key sets across PT
+ * and EN, and one translatable rendering differently per locale. The store's
+ * own {@code translate(key, locale)} is an exact-locale lookup (no fallback);
+ * the fallback chain runs in {@link GlobalTranslator#render}, which is what
+ * the locale-resolution tests exercise.
+ */
+class I18nTest {
+
+    private TranslationStore.StringBased<MessageFormat> store;
+
+    @BeforeEach
+    void registerStore() throws IOException {
+        store = TranslationStore.messageFormat(Key.key("canalhandia"));
+        store.defaultLocale(Locale.ENGLISH);
+        store.registerAll(Locale.ENGLISH, bundle("lang/messages_en.properties"), true);
+        store.registerAll(Locale.of("pt"), bundle("lang/messages_pt.properties"), true);
+        GlobalTranslator.translator().addSource(store);
+    }
+
+    @AfterEach
+    void unregisterStore() {
+        GlobalTranslator.translator().removeSource(store);
+    }
+
+    private static ResourceBundle bundle(String resource) throws IOException {
+        try (var in = I18nTest.class.getClassLoader().getResourceAsStream(resource)) {
+            assertNotNull(in, "bundle ausente no classpath: " + resource);
+            return new PropertyResourceBundle(new InputStreamReader(in, StandardCharsets.UTF_8));
+        }
+    }
+
+    private static String plain(Component c) {
+        return PlainTextComponentSerializer.plainText().serialize(c);
+    }
+
+    /** Every key in one bundle must exist in the other, or a locale shows the raw key. */
+    @Test
+    void bothBundlesHaveTheSameKeys() throws IOException {
+        var pt = new TreeSet<>(bundle("lang/messages_pt.properties").keySet());
+        var en = new TreeSet<>(bundle("lang/messages_en.properties").keySet());
+        assertEquals(pt, en,
+                "chaves divergentes — so no PT: " + only(pt, en) + ", so no EN: " + only(en, pt));
+    }
+
+    private static java.util.Set<String> only(java.util.Set<String> a, java.util.Set<String> b) {
+        var diff = new TreeSet<>(a);
+        diff.removeAll(b);
+        return diff;
+    }
+
+    /**
+     * A pt client and an en client see different text from one component.
+     * Rendering runs through {@link GlobalTranslator}, the same path Paper uses
+     * on send — the store itself only resolves a key to a {@link MessageFormat}.
+     */
+    @Test
+    void rendersDifferentlyPerLocale() {
+        Component translatable = Component.translatable("canalhandia.morte.luto.prestar",
+                Component.text("Steve"));
+
+        Component pt = GlobalTranslator.render(translatable, Locale.of("pt"));
+        Component en = GlobalTranslator.render(translatable, Locale.ENGLISH);
+        assertEquals("prestar luto por Steve", plain(pt));
+        assertEquals("pay respects for Steve", plain(en));
+    }
+
+    /** pt_BR falls back to pt via the GlobalTranslator chain. */
+    @Test
+    void ptBrFallsBackToPt() {
+        Component rendered = GlobalTranslator.render(
+                Component.translatable("canalhandia.morte.luto.resumo",
+                        Component.text("Ana, Bob"), Component.text("Steve")),
+                Locale.forLanguageTag("pt-BR"));
+        assertEquals("Ana, Bob prestaram luto por Steve.", plain(rendered));
+    }
+
+    /** An unknown locale renders in the default (en), not as the raw key. */
+    @Test
+    void unknownLocaleFallsBackToDefault() {
+        Component rendered = GlobalTranslator.render(
+                Component.translatable("canalhandia.morte.luto.prestar", Component.text("Steve")),
+                Locale.forLanguageTag("ja"));
+        assertEquals("pay respects for Steve", plain(rendered));
+    }
+}