Rewrite menu and modal text

Author: Yukaii

index.html

@@ -14,7 +14,7 @@
         <div class="modal-content">
           <div class="modal-header">
             <button type="button" class="close" data-dismiss="modal" aria-label="Close"><span aria-hidden="true">&times;</span></button>
-            <h4 class="modal-title">Customize server url</h4>
+            <h4 class="modal-title">Customize HackMD server</h4>
           </div>
           <div class="modal-body">
             <div class="form-group">

menu.js

@@ -72,7 +72,7 @@ const template = [
 				type: 'separator',
 			},
 			{
-				label: 'Config server url',
+				label: 'Customize HackMD server',
 				click () {
 					exec('configServerUrl');
 				}