fix small typo (#2360)

web/inc/prevent_csrf.php

@@ -23,7 +23,7 @@
             http_response_code(400);
             echo "<h1>Potential use CSRF detected</h1>\n".
             "<p>Please disable any plugins/add-ons inside your browser or contact your system administrator. If you are the system administrator you can run v-change-sys-config-value 'POLICY_CSRF_STRICTNESS' '0' as root to disable this check.<p>".
-            "<p>If you folowed a bookmark or an static link <a href='/'>please click here</a>";
+            "<p>If you followed a bookmark or an static link <a href='/'>please click here</a>";
             die();
         }
     }