Fix potential vulnerability

Author: ggeerraarrdd

templates/game.html

@@ -50,7 +50,7 @@
     <img src="{{ location.loc_image_url }}" width="400px"><br>
 
     <div class="container-bottom-image-source">
-        <a href="{{ location.loc_source_url }}" target="_blank">source</a>
+        <a href="{{ location.loc_source_url }}" target="_blank" rel="noopener noreferrer">source</a>
     </div>
 
     <div class="container-bottom-image-buttons">

templates/review.html

@@ -33,7 +33,7 @@
     <img src="{{ location.loc_image_url }}" width="400px"><br>
 
     <div class="container-bottom-image-source">
-        <a href="{{ location.loc_source_url }}" target="_blank">source</a>
+        <a href="{{ location.loc_source_url }}" target="_blank" rel="noopener noreferrer">source</a>
     </div>
 
     <div class="container-bottom-image-markers-label">