+ client: Allow Fastest IP address and Parallel requests to toggle each other: Merge pull request #619 in DNS/adguard-home from feature/1678 to master

Close #1678

Squashed commit of the following:

commit 9251ed0f1b58426104d1b9bdaa4b7af5f92be83e
Author: ArtemBaskal <a.baskal@adguard.com>
Date:   Thu May 21 18:25:18 2020 +0300

    + client: Allow `Fastest IP address` and `Parallel requests` to toggle each other

client/src/__locales/en.json

@@ -456,7 +456,7 @@
     "disable_ipv6": "Disable IPv6",
     "disable_ipv6_desc": "If this feature is enabled, all DNS queries for IPv6 addresses (type AAAA) will be dropped.",
     "fastest_addr": "Fastest IP address",
-    "fastest_addr_desc": "Query all DNS servers and return the fastest IP address among all responses",
+    "fastest_addr_desc": "Query all DNS servers and return the fastest IP address among all responses. This will slow down the DNS queries as we have to wait for responses from all DNS servers, but improve the overall connectivity.",
     "autofix_warning_text": "If you click \"Fix\", AdGuard Home will configure your system to use AdGuard Home DNS server.",
     "autofix_warning_list": "It will perform these tasks: <0>Deactivate system DNSStubListener</0> <0>Set DNS server address to 127.0.0.1</0> <0>Replace symbolic link target of /etc/resolv.conf with /run/systemd/resolve/resolv.conf</0> <0>Stop DNSStubListener (reload systemd-resolved service)</0>",
     "autofix_warning_result": "As a result all DNS requests from your system will be processed by AdGuard Home by default.",
@@ -490,4 +490,4 @@
     "list_updated_plural": "{{count}} lists updated",
     "dnssec_enable": "Enable DNSSEC",
     "dnssec_enable_desc": "Set DNSSEC flag in the outcoming DNS queries and check the result (DNSSEC-enabled resolver is required)"
-}
+}