Update arabian localization with library yml stuff to complete #802

+ lang_tag_ar to be compatible with moneropedia localization

_i18n/ar.yml

@@ -25,6 +25,7 @@ global:
   outdatedMax:
   outdatedVersion:
   outdatedMin:
+  lang_tag: "@lang_tag_ar"
 
 titles:
   index: الرئيسيه
@@ -58,6 +59,7 @@ titles:
   ffs-ot: مهمات مفتوحه
   ffs-wip: جاري العمل عليها
   blogbytag: التدوينه بالوصف
+  library: Library
 
 index:
   page_title: "مونيرو - آمن ,سري , لا يمكن تعقبها"
@@ -492,6 +494,41 @@ specs:
   amount_hidden_title: تعتيم الكميه
   amount_hidden_mode: مُعاملات الطوق السريه (Ring confidential transactions)
 
+library:
+  translated: "no"
+  description: "Below are some publications, books or magazines available for you to download."
+  books:
+  - category: Books
+    publications:
+    - name: "Zero to Monero"
+      file: "Zero-to-Monero-1-0-0.pdf"
+      abstract: >
+        A comprehensive conceptual (and technical) explanation of Monero.<br>
+        We endeavor to teach anyone who knows basic algebra and simple computer science concepts like the ‘bit representation’ of a number not only how Monero works at a deep and comprehensive level, but also how useful and beautiful cryptography can be.
+    - name: "Mastering Monero (Preview)"
+      file: "Mastering-Monero-Preview.pdf"
+      abstract: >
+        A guide through the seemingly complex world of Monero.<br>
+        It includes:
+        <ul><li>A broad introduction to blockchains and the importance of privacy - ideal for non-technical users.</li>
+        <li>Discussion of Bitcoin’s shortcomings and specific solutions provided by Monero.</li>
+        <li>User stories (illustrating how Monero protects your privacy), analogies, examples, legal/ethical discussions, and code snippets illustrating key technical concepts.</li>
+        <li>Details of the Monero decentralized network, peer-to-peer architecture, transaction lifecycle, and security principles.</li>
+        <li>Introductions to technical foundations of Monero, intended for developers, engineers, software architects, and curious users.</li>
+        <li>New developments such as Kovri, Bulletproofs, Multisignature, Hardware Wallets, etc.</li></ul>
+        See <a href="https://masteringmonero.com/">Mastering Monero</a> website for info about full version.
+  - category: Magazines
+    publications:
+    - name: "Revuo Monero Q4 2017"
+      file: "Revuo-2017-Q4.pdf"
+      abstract: >
+        Quarterly Monero magazine, Q4 2017 edition.<br>
+        In this issue, updates about: development, Monero Research Lab, Kovri, and community.
+    - name: "Revuo Monero Q3 2017"
+      file: "Monero-Revuo-3Q-2017.pdf"
+      abstract: >
+        Quarterly Monero magazine, Q3 2017 edition.<br>
+        In this issue, updates about: development, Monero Research Lab, Kovri, community, Hardware, and Monerujo.
 
 blog:
   title_1: الجميع