styling improvements

ui/src/app/app.html

@@ -926,7 +926,7 @@
           </th>
           <th scope="col">Name</th>
           <th scope="col">URL</th>
-          <th scope="col" class="text-nowrap"><span class="help-title" ngbPopover="Subscriptions only — which new video titles to queue when this feed is checked. Does not affect manual downloads." triggers="click" autoClose="outside" container="body">Sub. title filter</span></th>
+          <th scope="col" class="text-nowrap"><span class="help-title" ngbPopover="Subscriptions only — which new video titles to queue when this feed is checked. Does not affect manual downloads." triggers="click" autoClose="outside" container="body">Filter</span></th>
           <th scope="col" class="text-nowrap">Interval (min)</th>
           <th scope="col" class="text-nowrap">Last checked</th>
           <th scope="col">Status</th>

ui/src/app/app.sass

@@ -202,8 +202,6 @@ main
   margin-bottom: 0.4rem
 
 .help-title
-  text-decoration: underline dotted
-  text-underline-offset: 0.2em
   cursor: help
 
   &:focus