fix: add missing front matter delimiters to EN publications page

Author: deijany

content/en/publications.md

@@ -1,9 +1,7 @@
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 title: "Publications"
 intro: "(Last 3 Years)"
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 ## Journal Articles
 - **D. Rodriguez-Linares**, O. Moryakova, and H. Johansson, “Joint sampling frequency offset estimation and compensation algorithms based on the Farrow structure,” **Submitted to** *IEEE Open J. Signal Process.*, 2026 (journal extension of DSP 2025 conference paper). arXiv: [2603.00627](https://arxiv.org/abs/2603.00627).