🚩 Add symlink to translations-priorities.yml

[remibetin]

Context: https://github.com/w3c/wai-translations/issues/116

Needed to merge https://github.com/w3c/wai-about-wai/pull/221

🚩Dependencies

• Merge https://github.com/w3c/wai-website-data/pull/105 before this PR

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