Fix back-to-top button: add missing element and correct script path in all 14 proposition articles

[Copilot]

All 14 language versions of the 2026-03-04 government propositions articles referenced ../scripts/back-to-top.js (non-existent) instead of ../js/back-to-top.js, and were missing the id="back-to-top" button element the script binds to — causing a 404 and silent no-op on every page.

Changes

• Script path: ../scripts/back-to-top.js → ../js/back-to-top.js across all 14 files (scripts/ holds the TS source; compiled output is in js/)
• Button element: Added localized <button id="back-to-top"> to each page — required by js/back-to-top.js which uses getElementById('back-to-top') to bind scroll behavior

<!-- Before (broken) -->
<script type="module" src="../scripts/back-to-top.js"></script>

<!-- After (fixed) -->
<button id="back-to-top" class="back-to-top" type="button" aria-label="Back to top">↑</button>
<script type="module" src="../js/back-to-top.js"></script>

aria-label is localized per language (e.g. "返回顶部" for ZH, "Zurück zum Seitenanfang" for DE, "العودة إلى الأعلى" for AR).

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