chore(account): add note about activity using utc time

Author: Miodec

frontend/src/html/pages/account.html

@@ -307,6 +307,7 @@
         <div class="daysFull"></div>
         <div class="days"></div>
         <div class="nodata hidden">No data found.</div>
+        <div class="note">Note: All activity data is using UTC time.</div>
       </div>
     </div>
 

frontend/src/styles/account.scss

@@ -489,6 +489,13 @@
     // font-size: 0.75rem;
   }
 
+  .note {
+    grid-column: span 2;
+    text-align: center;
+    font-size: 0.6em;
+    color: var(--sub-color);
+  }
+
   .top {
     grid-area: top;
     display: grid;