Pull request: 4698 Gateway IP in DHCP Lease

Closes #4698.

Squashed commit of the following:

commit 6be0caee58926f8cea1e10650fbde0c8d97d0dac
Author: Ildar Kamalov <ik@adguard.com>
Date:   Fri Jul 8 13:41:50 2022 +0300

    update translation

commit e0370656d05e8463d73ea73568cae81187c6b2e3
Author: Ildar Kamalov <ik@adguard.com>
Date:   Fri Jul 8 13:40:54 2022 +0300

    client: validate static lease ip

commit 7f4d00f9f3a54dc93ce5d5c45e9c21745f6e39d1
Merge: 2ee79626 77e5e27d
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Fri Jul 8 13:20:15 2022 +0300

    Merge branch 'master' into 4698-lease-with-gateway

commit 2ee79626a1b0c7b113dbd22ba4ef6e85ea9913ec
Merge: 471b96b8 3505ce87
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Jul 7 19:34:33 2022 +0300

    Merge branch 'master' into 4698-lease-with-gateway

commit 471b96b81da8920c1e71b7110050154f912677d2
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Jul 7 16:07:23 2022 +0300

    dhcpd: imp docs

commit 67dd6c76f7d2df4712a57281e0f40f2ee1a1efa2
Author: Eugene Burkov <E.Burkov@AdGuard.COM>
Date:   Thu Jul 7 15:48:47 2022 +0300

    dhcpd: restrict gateway ip for lease

CHANGELOG.md

@@ -32,6 +32,8 @@ and this project adheres to
 
 ### Fixed
 
+- DHCP lease validation incorrectly letting users assign the IP address of the
+  gateway as the address of the lease ([#4698]).
 - Updater no longer expects a hardcoded name for  `AdGuardHome` executable
   ([#4219]).
 - Inconsistent names of runtime clients from hosts files ([#4683]).
@@ -44,6 +46,7 @@ and this project adheres to
 [#4219]: https://github.com/AdguardTeam/AdGuardHome/issues/4219
 [#4677]: https://github.com/AdguardTeam/AdGuardHome/issues/4677
 [#4683]: https://github.com/AdguardTeam/AdGuardHome/issues/4683
+[#4698]: https://github.com/AdguardTeam/AdGuardHome/issues/4698
 [#4699]: https://github.com/AdguardTeam/AdGuardHome/issues/4699
 
 [ddr-draft]: https://datatracker.ietf.org/doc/html/draft-ietf-add-ddr-08