Pull request: client: upd i18n

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

Squashed commit of the following:

commit e85d6eef7fca0eb61dd83d83069a637a71c66547
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Tue Aug 17 15:15:45 2021 +0300

    client: upd i18n

client/src/__locales/zh-cn.json

@@ -98,7 +98,7 @@
     "copyright": "版权",
     "homepage": "主页",
     "report_an_issue": "问题反馈",
-    "privacy_policy": "隐私策略",
+    "privacy_policy": "隐私政策",
     "enable_protection": "启用保护",
     "enabled_protection": "保护已启用",
     "disable_protection": "禁用保护",
@@ -597,7 +597,7 @@
     "cache_ttl_min_override_desc": "缓存 DNS 响应时，延长从上游服务器接收到的 TTL 值 (秒)",
     "cache_ttl_max_override_desc": "设定 DNS 缓存条目的最大 TTL 值（秒）",
     "ttl_cache_validation": "最小缓存TTL值必须小于或等于最大值",
-    "cache_optimistic": "优化的",
+    "cache_optimistic": "乐观缓存",
     "cache_optimistic_desc": "即使条目已过期，也让 AdGuard Home 从缓存中响应，并尝试刷新它们。",
     "filter_category_general": "常规",
     "filter_category_security": "安全",