New help popup for import option 'match grades'.

Needs some more info.

diff --git a/lang/en_utf8/help/quiz/matchgrades.html b/lang/en_utf8/help/quiz/matchgrades.html
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+<p align="center"><b>Match Grades</b></p>
+
+<p>Imported grades <b>must</b> match one of the
+fixed list of valid grades, as follows...</p>
+
+<ul>
+  <li>100%</li>
+  <li>90%</li>
+  <li>80%</li>
+  <li>75%</li>
+  <li>70%</li>
+  <li>66.666%</li>
+  <li>60%</li>
+  <li>50%</li>
+  <li>40%</li>
+  <li>33.333</li>
+  <li>30%</li>
+  <li>25%</li>
+  <li>20%</li>
+  <li>16.666%</li>
+  <li>14.2857</li>
+  <li>12.5%</li>
+  <li>11.111%</li>
+  <li>10%</li>
+  <li>5%</li>
+  <li>0%</li>
+</ul>
+
+<p>negative values of the above list
+are also permitted</p>
+