Pull request: client: imp en locale

Merge in DNS/adguard-home from imp-i18n to master

Squashed commit of the following:

commit 637cff9
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Apr 12 13:43:17 2021 +0300

    client: imp en locale

client/src/__locales/en.json

@@ -139,7 +139,7 @@
     "encryption_settings": "Encryption settings",
     "dhcp_settings": "DHCP settings",
     "upstream_dns": "Upstream DNS servers",
-    "upstream_dns_help": "Enter servers addresses one per line. <a>Learn more</a> about configuring upstream DNS servers.",
+    "upstream_dns_help": "Enter one server address per line. <a>Learn more</a> about configuring upstream DNS servers.",
     "upstream_dns_configured_in_file": "Configured in {{path}}",
     "test_upstream_btn": "Test upstreams",
     "upstreams": "Upstreams",