change "data gathering" toggle label on admin-overview.html

The term "data gathering" suggests telemetry or some kind of surveillance of users.

It wasn't until I checked the discussion section on Github that I understood this actually meant fetching data from 3rd party sources. This change is to change the English label for this toggle to avoid misunderstandings for users.

apps/client/src/app/components/admin-overview/admin-overview.html

@@ -134,7 +134,7 @@
             </div>
           }
           <div class="d-flex my-3">
-            <div class="w-50" i18n>Data Gathering</div>
+            <div class="w-50" i18n>Fetch Market Data</div>
             <div class="w-50">
               <mat-slide-toggle
                 color="primary"