# Troubleshooting > Quick fixes for common, isolated issues in deco.cx storefronts. Use when the user reports a specific symptom that doesn't warrant a full skill. This is a growing knowledge base — add new entries as they're discovered. - Skill: `decocms/troubleshooting` (Agent Skill) - Install (CLI): `npx skillmds@latest add decocms/troubleshooting` - Raw SKILL.md: https://api.skillmd.com/api/skills/decocms/troubleshooting/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Research & Search - Author: decocms (https://skillmd.com/u/decocms) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/decocms/troubleshooting --- A living collection of quick fixes for one-off problems in deco.cx storefronts. Each entry describes the symptom, root cause, and exact fix. --- ## Entries ### HTML `lang` attribute wrong or missing **Symptom:** The page renders with `` (or no `lang`) but the site is in Portuguese (or another language). Accessibility tools and SEO audits flag the mismatch. **Root cause:** In Deno Fresh, the `lang` attribute on `` is set via `ctx.lang` inside the `render` callback of `fresh.config.ts`. If the line is absent, Fresh defaults to `"en"`. **Fix:** Open `fresh.config.ts` at the project root and add (or update) the `render` callback: ```ts import { defineConfig } from "$fresh/server.ts"; import { plugins } from "deco/plugins/deco.ts"; import manifest from "./manifest.gen.ts"; export default defineConfig({ plugins: plugins({ manifest, htmx: true, // keep whatever options were already here }), render: (ctx, render) => { ctx.lang = "pt-BR"; // ← set to the correct BCP-47 language tag render(); }, }); ``` Common language tags: `pt-BR`, `pt-PT`, `en`, `en-US`, `es`, `es-AR`. **Verify:** After deploying, inspect the page source and confirm ``. ---