i18n(ja): Update customization.mdx

[morinokami]

Description

• Update ja/guides/customization.mdx.
• diff
  • Add RSS icon #792
  • Add Telegram icon #794
  • add twitter new logo #752
  • Add Facebook and email icons #815
  • feat: add Reddit social icon #854
  • Add Patreon social link #892
  • docs: refactor social links configuration reference #869
  • Add more EC text markers and frames to Starlight docs #1102

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Latest commit: d502973

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Name	Status	Preview	Updated (UTC)
starlight	✅ Ready (Inspect)	Visit Preview	Dec 2, 2023 8:32pm

[HiDeoo]

Thanks for the updated translation. Everything looks good to me 👍