Improve student discount wording

Change-Id: I3580841b23eaca02fa94731de7eb9fac1957110a
diff --git a/templates/register.htm b/templates/register.htm
index fd52252..e3a4425 100644
--- a/templates/register.htm
+++ b/templates/register.htm
@@ -498,7 +498,7 @@
         <label class="form-label fw-bold" for="student">Student Discount</label>
         <div class="form-group form-check">
             <input type="checkbox" class="form-check-input" name="student" id="student" <?php echo isset($_POST[ 'student']) ? 'checked' : '' ?> oninput="update_total_due()" value="student">
-            <label class="form-check-label fs-4" for="student">I have (just) sent a scan of my matriculation certificate to <a href="mailto:iclc10&commat;easychair&period;org">iclc10&commat;easychair&period;org</a>
+            <label class="form-check-label fs-4" for="student">I have (just) sent a scan or photo of my matriculation certificate to <a href="mailto:iclc10&commat;easychair&period;org">iclc10&commat;easychair&period;org</a>
 and can therefore take advantage of the student discount of <strong>€&nbsp;<span id="student_discount"><?php echo $STUDENT_DISCOUNT; ?></span></strong>.
             </label>
         </div>