change hotkey for net from 'e' to 't'

chose 't' for the next best as 'e' is reserved in English browsers for edit

kole.html

@@ -88,8 +88,8 @@
 			<input readonly="readonly" type="number" step="0.01" id="us" value="0.00"/>&thinsp;&euro;
 		</div>
 		<div>
-			<label for="n">N<u>e</u>tto</label>
-			<input accesskey="e" type="number" step="0.01" id="n" value="0.00"/>&thinsp;&euro;
+			<label for="n">Ne<u>t</u>to</label>
+			<input accesskey="t" type="number" step="0.01" id="n" value="0.00"/>&thinsp;&euro;
 		</div>
 		<div>
 			<label for="ec">Entropie-Tarif&#x202F;&sup1;</label><!-- ggf. k&uuml;nftig Grundlage wie Handbuch/Dokumentation verlinken -->