adds i18n to all devise views

ref: #38

app/views/devise/unlocks/new.html.erb

@@ -1,15 +1,15 @@
-<h2>Resend unlock instructions</h2>
+<h2><%= t("devise_views.unlocks.new.title") %></h2>
 
 <%= form_for(resource, as: resource_name, url: unlock_path(resource_name), html: { method: :post }) do |f| %>
   <%= devise_error_messages! %>
 
   <div class="field">
-    <%= f.label :email %><br />
+    <%= f.label :email, t("devise_views.unlocks.new.email_label") %><br />
     <%= f.email_field :email, autofocus: true %>
   </div>
 
   <div class="actions">
-    <%= f.submit "Resend unlock instructions" %>
+    <%= f.submit t("devise_views.unlocks.new.submit") %>
   </div>
 <% end %>