Display username in header

src/invidious/views/template.ecr

@@ -67,6 +67,11 @@
                                 <i class="icon ion-ios-cog"></i>
                             </a>
                         </div>
+                        <% if env.get("preferences").as(Preferences).show_nick %>
+                            <div class="pure-u-1-4">
+                                <span id="user_name"><%= translate(locale, "Welcome, `x`", env.get("user").as(User).email) %></span>
+                            </div>
+                        <% end %>
                         <div class="pure-u-1-4">
                             <form action="/signout?referer=<%= env.get?("current_page") %>" method="post">
                                 <input type="hidden" name="csrf_token" value="<%= URI.encode_www_form(env.get?("csrf_token").try &.as(String) || "") %>">