Force the Donation app to use English

content/pages/en/support.rst

@@ -24,7 +24,7 @@ Users can choose a suitable support channel:
 
 .. raw:: html
 
-    <a class="donation-button" href="https://donations.nic.cz/donate/?project=knot-dns">Donate</a>
+    <a class="donation-button" href="https://donations.nic.cz/en/donate/?project=knot-dns">Donate</a>
 
 .. _CZ.NIC: https://www.nic.cz
 .. _knot-dns@labs.nic.cz: mailto:knot-dns@labs.nic.cz