Add Armenian and Serbian whitepapers

Add Armenian and Serbian translations of whitepaper

Author: Cobra-Bitcoin

_templates/bitcoin-paper.html

@@ -29,6 +29,15 @@ <h1>{% translate pagetitle %}</h1>
             <a class="language-link" href="/bitcoin.pdf">English (Original)</a>
           </b>
         </li>
+        
+        <li class="card bitcoin-paper-card">
+          <a class="language-link"
+            href="/files/bitcoin-paper/bitcoin_am.pdf">հայերեն լեզու</a>
+          <div>
+            <span>{% translate translated_by %}</span>
+            <span>Diana Sisakian</span>, sponsored by <a href="https://cleartalks.com">Cleartalks</a>
+          </div>
+        </li>
 
         <li class="card bitcoin-paper-card">
           <a class="language-link"
@@ -188,6 +197,15 @@ <h1>{% translate pagetitle %}</h1>
             <a href="https://github.com/OndroS">Ondrej Sarnecký</a>
           </div>
         </li>
+        
+        <li class="card bitcoin-paper-card">
+          <a class="language-link"
+            href="/files/bitcoin-paper/bitcoin_sr.pdf">српски</a>
+          <div>
+            <span>{% translate translated_by %}</span>
+            <span>Božo Popović</span>
+          </div>
+        </li>
 
         <li class="card bitcoin-paper-card">
           <a class="language-link"