wording fix for issue#2441 (commons-app#2745)

Author: JobGetabu

app/src/main/res/values/strings.xml

@@ -458,7 +458,7 @@ Upload your first media by tapping on the add button.</string>
   <string name="achievements_fetch_failed">Something went wrong, We could not fetch your achievements</string>
   <string name="ends_on">Ends on:</string>
   <string name="display_campaigns">Display campaigns</string>
-  <string name="display_campaigns_explanation">Tap here to see the ongoing campaigns</string>
+  <string name="display_campaigns_explanation">See the ongoing campaigns</string>
   <string name="nearby_campaign_dismiss_message">You won\'t see the campaigns anymore. However, you can re-enable this notification in Settings if you wish.</string>
 
   <string name="this_function_needs_network_connection">This function requires network connection, please check your connection settings.</string>