Pull request: client: upd i18n

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

Squashed commit of the following:

commit f52a8ab20389f094211039f14bd6f934042c68e1
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Wed Nov 3 13:58:40 2021 +0300

    client: upd i18n

client/src/__locales/sr-cs.json

@@ -226,8 +226,10 @@
     "custom_ip": "Prilagođeni IP",
     "blocking_ipv4": "Blokiranje IPv4",
     "blocking_ipv6": "Blokiranje IPv6",
+    "dnscrypt": "DNSCrypt",
     "dns_over_https": "DNS-over-HTTPS",
     "dns_over_tls": "DNS-over-TLS",
+    "dns_over_quic": "DNS-over-QUIC",
     "download_mobileconfig_doh": "Preuzimanja",
     "download_mobileconfig_dot": "Preuzmi .mobileconfig za DNS-over-TLS",
     "plain_dns": "Plain DNS",
@@ -430,6 +432,7 @@
     "encryption_key_source_content": "Nalepi sadržaj privatnog ključa",
     "stats_params": "Konfiguracija statistike",
     "config_successfully_saved": "Konfiguracija je uspešno sačuvana",
+    "interval_6_hour": "6 sati",
     "interval_24_hour": "24 časa",
     "interval_days": "{{count}} dan",
     "interval_days_plural": "{{count}} dana",