Merge: * update translations

Close #1250

Squashed commit of the following:

commit e722a3e3b4b1049c5df22b3f11b5826992d3cc6c
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Thu Dec 12 18:27:51 2019 +0300

    update ru

commit 086e722a4dc1922ac7b8aff537050689900a8bd0
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Thu Dec 12 18:15:15 2019 +0300

    fix cloudflare -> quad9, update es

commit 86c235936d2f86e536f45fc475f29b43eb695e3d
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Thu Dec 12 18:01:20 2019 +0300

    * update es, ru, sr-cs

commit 2b6b510b998b7e7b2f4c3fa5d7af57dc5413a611
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Thu Dec 12 17:43:05 2019 +0300

    * update 'no'

commit 1de6215aa90374ee147bbd0a685643232e98e4c8
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Thu Dec 12 17:41:37 2019 +0300

    * use dnsproxy v0.23.2

commit c545a1bf7e4e706b45b4670b804a50bf8d75bae3
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Thu Dec 12 17:36:37 2019 +0300

    update ru

commit c22eec9bcfad67284e21cfc4e6b06fb63a64d25d
Author: Simon Zolin <s.zolin@adguard.com>
Date:   Thu Dec 12 17:22:03 2019 +0300

    * update translations;  add sr-cs, fa, hr

client/src/helpers/constants.js

@@ -118,6 +118,22 @@ export const LANGUAGES = [
         key: 'zh-cn',
         name: '简体中文',
     },
+    {
+        key: 'no',
+        name: 'Norsk',
+    },
+    {
+        key: 'sr-cs',
+        name: 'Srpski',
+    },
+    {
+        key: 'hr',
+        name: 'Hrvatski',
+    },
+    {
+        key: 'fa',
+        name: 'فارسی',
+    },
     {
         key: 'ko',
         name: '한국어',