👔 Set Site DefaultLanguage as Language for monolingual sites

internal/site/usecase/site_ucase.go

@@ -33,6 +33,10 @@ func (ucase *siteUseCase) Do(ctx context.Context, lang domain.Language) (*domain
 		}
 	}
 
+	if !out.IsMultiLingual() {
+		out.Language = out.DefaultLanguage
+	}
+
 	sub, err := ucase.sites.Get(ctx, lang)
 	if err != nil {
 		return out, nil