Fix duplicate meta keywords and twitter:data1 format in week-ahead articles

[Copilot]

Review feedback on 2026-03-12 week-ahead articles: duplicate keyword pairs in meta tags and inconsistent twitter:data1 values in CJK locales.

Deduplicate meta keywords (13 files)

All non-EN language files had calendar/events keyword pairs repeated twice:

<!-- before -->
<meta name="keywords" content="parlament, ..., kalender, hendelser, kalender, hendelser, debatter, ...">

<!-- after -->
<meta name="keywords" content="parlament, ..., kalender, hendelser, debatter, ...">

Affected: sv, de, fr, es, nl, da, no, fi, ar, he, ja, ko, zh

Fix twitter:data1 format (zh, ja, ko)

Aligned with existing article conventions — value-only, no label repetition:

Lang	Before	After
zh	阅读时间：5分钟	5分钟阅读
ja	読了時間：5分	約5分
ko	읽기 시간: 5분	5분 소요

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