Fix inline theme script and SV labelling inconsistency in week-ahead articles

[Copilot]

Addresses two review comments from PR #1087.

• External theme-init.js: Replaced inlined anti-flash theme initializer with <script src="../js/theme-init.js"></script> across all 14 language versions, matching the shared implementation used by other news pages
• SV label alignment: Standardized "Vecka Framåt" → "Veckan som kommer" in title, H1, og:title, Schema.org headline, and BreadcrumbList to match established convention

<!-- Before -->
<script>(function(){var key='riksdagsmonitor-theme';var t=null;try{t=localStorage.getItem(key);}catch(e){} ... }());</script>

<!-- After -->
<script src="../js/theme-init.js"></script>

All 14 articles pass HTMLHint validation.

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