feat: translate backend

src/main/java/fr/titionfire/ffsaf/domain/service/TradService.java

@@ -0,0 +1,41 @@
+package fr.titionfire.ffsaf.domain.service;
+
+import jakarta.enterprise.context.RequestScoped;
+import jakarta.enterprise.inject.Instance;
+import jakarta.inject.Inject;
+import jakarta.ws.rs.container.ContainerRequestContext;
+
+import java.util.Locale;
+import java.util.MissingResourceException;
+import java.util.ResourceBundle;
+
+@RequestScoped
+public class TradService {
+
+    @Inject
+    Instance<ContainerRequestContext> requestContextInstance;
+
+    public static final Locale fallbackLocale = Locale.FRANCE;
+
+    public String t(String key) {
+        return translate(key);
+    }
+
+    public String translate(String key) {
+        ContainerRequestContext requestContext = requestContextInstance.get();
+        Locale userLocale = (Locale) requestContext.getProperty("userLocale");
+
+
+        try {
+            ResourceBundle messages = ResourceBundle.getBundle("lang.messages", userLocale);
+            return messages.getString(key);
+        } catch (MissingResourceException e) {
+            try {
+                ResourceBundle fallbackMessages = ResourceBundle.getBundle("lang.messages", fallbackLocale);
+                return fallbackMessages.getString(key);
+            } catch (MissingResourceException ex) {
+                return key;
+            }
+        }
+    }
+}