Pull request: client: add fi, uk locales

Merge in DNS/adguard-home from add-fi-uk to master

Squashed commit of the following:

commit eb293912036ddb4f209827f3e3f87e849c402c6c
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Nov 15 14:26:35 2021 +0300

    client: fix locale selection

commit 077b7ede31dd6ec0a154d38b32d40a3dd39ba383
Author: Ainar Garipov <A.Garipov@AdGuard.COM>
Date:   Mon Nov 15 14:10:55 2021 +0300

    client: add fi, uk locales

internal/home/i18n.go

@@ -10,7 +10,7 @@ import (
 	"github.com/AdguardTeam/golibs/stringutil"
 )
 
-// TODO(a.garipov): Get rid of a global variable?
+// TODO(a.garipov): Get rid of a global or generate from .twosky.json.
 var allowedLanguages = stringutil.NewSet(
 	"be",
 	"bg",
@@ -20,6 +20,7 @@ var allowedLanguages = stringutil.NewSet(
 	"en",
 	"es",
 	"fa",
+	"fi",
 	"fr",
 	"hr",
 	"hu",
@@ -41,6 +42,7 @@ var allowedLanguages = stringutil.NewSet(
 	"sv",
 	"th",
 	"tr",
+	"uk",
 	"vi",
 	"zh-cn",
 	"zh-hk",