Fix language in Fio account links

Author: encukou

pyvecorg/templates/index.html

@@ -337,7 +337,7 @@ <h3>{{ bank_account.heading }}</h3>
                                         SWIFT: {{ bank_account.swift }}<br>
                                         {{ bank_account.bank_name }}<br>
                                     {% endif %}
-                                    <a href="https://ib.fio.cz/ib/transparent?a={{ bank_account.number }}&amp;l=ENGLISH">Transaction history</a>
+                                    <a href="https://ib.fio.cz/ib/transparent?a={{ bank_account.number }}&amp;lng=ENGLISH">Transaction history</a>
                                 {% endif %}
                             </p>
                         {% endfor %}