Update from code changes: sync xurl OAuth2 setup notes to translations

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Summary

Syncs the English MCP page's xurl OAuth2 credential clarifications into the Spanish, Japanese, Korean, and Portuguese translations so users of all locales get the same guidance and troubleshooting steps.

Changes

• Extended setup step 3 to warn that CLIENT_ID and CLIENT_SECRET must be exported in the shell when running xurl auth oauth2 manually.
• Added export CLIENT_ID / export CLIENT_SECRET lines (with a localized comment) to the headless authentication code block, noting the client env block does not apply to manual xurl runs.
• Added a Note under "Multiple apps & accounts" explaining that the OAuth login authorizes whichever X account is signed in when the browser opens.
• Added a troubleshooting row for the browser error "Something went wrong — You weren't able to give access to the App" pointing users at missing CLIENT_ID / CLIENT_SECRET.

Context

The English tools/mcp.mdx and tools/xurl.mdx pages already document this guidance (added in response to developer feedback about the OAuth login failing when credentials aren't exported). Translated MCP pages were still missing the four additions — this PR brings them in sync.

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