fix(guide): spell out abbreviated deadline months in SI/EN tables

Mirror the Macedonian reviewer's date fix to Slovenian and English: expand
feb/mar/sep... to full month names inside the deadline table cells on
application-deadlines, bachelor- and master-application (SI + EN).
Replacement is scoped to <td> cells to avoid touching words like SI 'nov'.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

en/student-welcome-guide/master-application/index.html

@@ -241,9 +241,9 @@
                         <thead><tr><th>University</th><th>Category</th><th>2026/2027 periods</th></tr></thead>
                         <tbody>
                         <tr><td>University of Ljubljana</td><td>Western Balkan or non-EU places</td><td>Faculty and programme specific</td></tr>
-                        <tr><td>University of Maribor</td><td>Non-EU</td><td>31 Mar to 30 Apr; possible 24 Aug to 4 Sep; possible 22 to 23 Sep</td></tr>
-                        <tr><td>University of Primorska</td><td>Western Balkans</td><td>8 Apr to 3 Aug; 13 to 20 Aug; 1 to 8 Sep; 23 to 24 Sep</td></tr>
-                        <tr><td>University of Nova Gorica</td><td>Programme call</td><td>18 Feb to 18 Mar; 1 Apr to 1 Jun; 1 Aug to 1 Sep; 10 to 24 Sep</td></tr>
+                        <tr><td>University of Maribor</td><td>Non-EU</td><td>31 March to 30 April; possible 24 August to 4 September; possible 22 to 23 September</td></tr>
+                        <tr><td>University of Primorska</td><td>Western Balkans</td><td>8 April to 3 August; 13 to 20 August; 1 to 8 September; 23 to 24 September</td></tr>
+                        <tr><td>University of Nova Gorica</td><td>Programme call</td><td>18 February to 18 March; 1 April to 1 June; 1 August to 1 September; 10 to 24 September</td></tr>
                         </tbody>
                     </table>
                 </div>