fix(html): isolate cloned default translators

Co-Authored-By: Virgil <virgil@lethean.io>

context.go

@@ -35,6 +35,7 @@ func (ctx *Context) Clone() *Context {
 			clone.Data[key] = value
 		}
 	}
+	clone.service = cloneTranslator(clone.service, clone.Locale)
 	return &clone
 }
 

context_test.go

@@ -175,6 +175,24 @@ func TestContext_CloneCopiesDataWithoutSharingMap(t *testing.T) {
 	}
 }
 
+func TestContext_CloneDoesNotShareDefaultTranslator(t *testing.T) {
+	ctx := NewContext("en-GB")
+
+	clone := ctx.Clone()
+	if clone == nil {
+		t.Fatal("Clone should return a context")
+	}
+
+	clone.SetLocale("fr-FR")
+
+	if got := Text("prompt.yes").Render(ctx); got != "y" {
+		t.Fatalf("Clone should not mutate original default translator, got %q", got)
+	}
+	if got := Text("prompt.yes").Render(clone); got != "o" {
+		t.Fatalf("Clone should keep its own default translator, got %q", got)
+	}
+}
+
 func TestContext_WithDataReturnsClonedContext(t *testing.T) {
 	ctx := NewContext()
 	ctx.SetData("theme", "dark")

translator_clone_default.go

@@ -0,0 +1,21 @@
+//go:build !js
+
+// SPDX-Licence-Identifier: EUPL-1.2
+
+package html
+
+import i18n "dappco.re/go/core/i18n"
+
+func cloneTranslator(svc Translator, locale string) Translator {
+	if svc == nil {
+		return nil
+	}
+
+	if current, ok := svc.(*i18n.Service); ok && current != nil {
+		clone := &i18n.Service{}
+		applyLocaleToService(clone, locale)
+		return clone
+	}
+
+	return svc
+}

translator_clone_js.go

@@ -0,0 +1,18 @@
+//go:build js
+
+// SPDX-Licence-Identifier: EUPL-1.2
+
+package html
+
+func cloneTranslator(svc Translator, _ string) Translator {
+	if svc == nil {
+		return nil
+	}
+
+	if current, ok := svc.(*defaultTranslator); ok && current != nil {
+		clone := *current
+		return &clone
+	}
+
+	return svc
+}