Improves styles for admin newsletters

app/views/admin/_menu.html.erb

@@ -165,7 +165,7 @@
 
     <li <%= "class=active" if controller_name == "newsletter" %>>
       <%= link_to admin_newsletters_path do %>
-        <span class="icon-stats"></span>
+        <span class="icon-zip"></span>
         <%= t("admin.menu.newsletter") %>
       <% end %>
     </li>

app/views/admin/newsletters/index.html.erb

@@ -1 +1,3 @@
-<%= link_to 'users', users_admin_newsletters_path %>
+<h2><%= t("admin.newsletters.index.title") %></h2>
+
+<%= link_to t("admin.newsletters.index.button"), users_admin_newsletters_path, class: "button" %>

config/locales/admin.en.yml

@@ -237,6 +237,10 @@ en:
         email_placeholder: Search user by email
         search: Search
         user_not_found: User not found
+    newsletters:
+      index:
+        title: Newsletters
+        button: Download zip with users list
     valuators:
       index:
         title: Valuators

config/locales/admin.es.yml

@@ -205,7 +205,7 @@ es:
       hidden_users: Usuarios bloqueados
       managers: Gestores
       moderators: Moderadores
-      newsletter: Newsletters
+      newsletter: Envío de Newsletters
       valuators: Evaluadores
       poll_officers: Presidentes de mesa
       polls: Votaciones
@@ -237,6 +237,10 @@ es:
         email_placeholder: Buscar usuario por email
         search: Buscar
         user_not_found: Usuario no encontrado
+    newsletters:
+      index:
+        title: Envío de newsletters
+        button: Descargar zip con lista de usuarios
     valuators:
       index:
         title: Evaluadores