Undergraduate: Διαφορά μεταξύ των αναθεωρήσεων

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 <div class="card h-100">
 <div class="card-header">
+<div class="btn-toolbar justify-content-center" role="toolbar" aria-label="Toolbar GR">
+<div class="btn-group mr-2" role="group" aria-label="Group 01">
+<btn type="button" class="btn btn-outline-primary btn-sm">https://wiki.math.uoi.gr|<span class="fa fa-home"></span>&nbsp;&nbsp;Κεντρική Κανονισμών</btn>
+<btn type="button" class="btn btn-outline-primary btn-sm">https://math.uoi.gr|<span class="fa fa-university"></span>&nbsp;&nbsp;Κεντρική Τμήματος</btn>
+</div>
+</div>
 <h3 class="card-title text-primary" style="padding-top: 10px; padding-bottom:10px;">Προπτυχιακές Σπουδές</h3>
 </div>
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 <div class="card h-100">
 <div class="card-header">
+<div class="btn-toolbar justify-content-center" role="toolbar" aria-label="Toolbar EN">
+<div class="btn-group mr-2" role="group" aria-label="Group 01">
+<btn type="button" class="btn btn-outline-primary btn-sm">https://regulations.math.uoi.gr/|<span class="fa fa-home"></span>&nbsp;&nbsp;Regulations' Homepage</btn>
+<btn type="button" class="btn btn-outline-primary btn-sm">https://math.uoi.gr/en|<span class="fa fa-university"></span>&nbsp;&nbsp;Department's Homepage</btn>
+</div>
+</div>
 <h3 class="card-title text-primary" style="padding-top: 10px; padding-bottom:10px;">Undergraduate Studies</h3>
 </div>