Disable language selector

The Japanese translated version of xrpl.org has been falling behind.
Since it's a worse experience to see a page that's mostly untranslated,
which is the case for many of the new/updated page, and traffic to the
Japanese version of the site is <1% of total traffic, we are temporarily
disabling the language selector so that we don't direct people to the
largely-untranslated pages. The existing URLs, including pages that have
been fully translated, continue to work.

template/component-top-nav.html.jinja

@@ -70,6 +70,7 @@
       </form>
     </div><!--/#topnav-search-->
 
+<!--{#TEMPORARILY DISABLED: language selector (many common pages are mostly untranslated right now)
     <div class="nav-item" id="topnav-language">
       <div class="dropdown">
         <a class="nav-link dropdown-toggle with-caret" id="language_selector_header_btn" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
@@ -87,5 +88,6 @@
         </div><!--/.dropdown-menu-->
       </div><!--/.dropdown-->
     </div><!--/.language-selector-->
+#}-->
   </div><!--/#top-main-nav-->
 </nav>