feat(html): make default context locale-aware

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

context.go

@@ -1,5 +1,7 @@
 package html
 
+import i18n "dappco.re/go/core/i18n"
+
 // context.go: Translator provides Text() lookups for a rendering context.
 // Example: a locale-aware service can satisfy T(key, args...).
 type Translator interface {
@@ -59,10 +61,12 @@ func normaliseContext(ctx *Context) *Context {
 // An optional locale may be provided as the first argument.
 func NewContext(locale ...string) *Context {
 	ctx := &Context{
-		Data: make(map[string]any),
+		Data:    make(map[string]any),
+		service: &i18n.Service{},
 	}
 	if len(locale) > 0 {
 		ctx.Locale = locale[0]
+		applyLocaleToService(ctx.service, ctx.Locale)
 	}
 	return ctx
 }

context_test.go

@@ -36,6 +36,14 @@ func TestContext_NewContextWithService_AppliesLocale(t *testing.T) {
 	}
 }
 
+func TestContext_NewContext_AppliesLocaleToDefaultService(t *testing.T) {
+	ctx := NewContext("fr-FR")
+
+	if got := Text("prompt.yes").Render(ctx); got != "o" {
+		t.Fatalf("NewContext(locale) translation = %q, want %q", got, "o")
+	}
+}
+
 func TestContext_NewContextWithService_UsesLocale(t *testing.T) {
 	svc := &localeTranslator{}
 	ctx := NewContextWithService(svc, "en-GB")

deps/go-i18n/i18n.go

@@ -1,9 +1,14 @@
 package i18n
 
-import "fmt"
+import (
+	"fmt"
+	"strings"
+)
 
 // Service is a minimal translation service for local verification.
-type Service struct{}
+type Service struct {
+	language string
+}
 
 var defaultService = &Service{}
 
@@ -20,6 +25,23 @@ func SetDefault(svc *Service) {
 	defaultService = svc
 }
 
+// SetLanguage records the active language for locale-aware lookups.
+func (s *Service) SetLanguage(language string) error {
+	if s == nil {
+		return nil
+	}
+
+	base := language
+	for i := 0; i < len(base); i++ {
+		if base[i] == '-' || base[i] == '_' {
+			base = base[:i]
+			break
+		}
+	}
+	s.language = strings.ToLower(base)
+	return nil
+}
+
 // T returns a translated string for key.
 func T(key string, args ...any) string {
 	return defaultService.T(key, args...)
@@ -27,6 +49,17 @@ func T(key string, args ...any) string {
 
 // T returns a translated string for key.
 func (s *Service) T(key string, args ...any) string {
+	if s != nil {
+		switch key {
+		case "prompt.yes":
+			switch s.language {
+			case "fr":
+				return "o"
+			case "en":
+				return "y"
+			}
+		}
+	}
 	if len(args) == 0 {
 		return key
 	}