Infrastructure: add javascript to cspell (pull #3329)

* chore: add javascript to cspell
* fix(JavaScript): capitalization

Author: ariellalgilmore

content/patterns/disclosure/examples/disclosure-card.html

@@ -602,7 +602,7 @@ <h2>JavaScript and CSS Source Code</h2>
             <a href="css/disclosure-card.css">disclosure-card.css</a>
           </li>
           <li>
-            Javascript:
+            JavaScript:
             <a href="js/disclosure-card.js">disclosure-card.js</a>
           </li>
         </ul>

content/patterns/spinbutton/examples/quantity-spinbutton.html

@@ -434,7 +434,7 @@ <h2>JavaScript and CSS Source Code</h2>
             <a href="css/quantity-spinbutton.css" type="text/css">quantity-spinbutton.css</a>
           </li>
           <li>
-            Javascript:
+            JavaScript:
             <ul>
               <li><a href="js/quantity-spinbutton.js" type="text/javascript">quantity-spinbutton.js</a></li>
             </ul>

cspell.json

@@ -125,6 +125,8 @@
     "IUCN",
     "Jaeun",
     "jarosewli",
+    "!Javascript",
+    "JavaScript",
     "Jemma",
     "Jèrôme",
     "Jinyuan",