Fix button labels and click handlers for login/register

- Add goToLogin and goToSignup action methods
- Use @translatedLabel instead of @label for proper i18n rendering
- Fix @action to reference proper component methods
- Buttons now display correct translated text and navigate properly

javascripts/discourse/components/welcome-banner.gjs

@@ -65,6 +65,14 @@ export default class WelcomeBanner extends Component {
     // Search menu will be handled by Discourse's native component
   }
 
+  goToLogin = () => {
+    this.router.transitionTo("login");
+  };
+
+  goToSignup = () => {
+    this.router.transitionTo("signup");
+  };
+
   <template>
     {{#if this.shouldDisplay}}
       {{#if settings.custom_css}}
@@ -84,13 +92,13 @@ export default class WelcomeBanner extends Component {
               {{#if this.isAnonymous}}
                 <div class="hero-buttons">
                   <DButton
-                    @action={{this.router.transitionTo "login"}}
-                    @label={{i18n "welcome_banner.buttons.login"}}
+                    @action={{this.goToLogin}}
+                    @translatedLabel={{i18n "welcome_banner.buttons.login"}}
                     class="btn-primary hero-login-btn"
                   />
                   <DButton
-                    @action={{this.router.transitionTo "signup"}}
-                    @label={{i18n "welcome_banner.buttons.register"}}
+                    @action={{this.goToSignup}}
+                    @translatedLabel={{i18n "welcome_banner.buttons.register"}}
                     class="btn-default hero-register-btn"
                   />
                 </div>