rename clock seperator to time seperator in ui

preferences.html

@@ -37,7 +37,7 @@
             <label for="enable-clock">Enable Clock</label>
         </div>
         <div id="clock-seperator-container">
-            <label for="clock-seperator-input">Which clock seperator should be used? </label>
+            <label for="clock-seperator-input">Which time seperator should be used? </label>
             <input type="text" id="clock-seperator-input" placeholder="default: '|'">
         </div>
         <div id="date-seperator-container">