Radio button choice to show up on main page

[sbzero546]

I am entering information about a book and trying to get my language choice to go on my main page. The problem is with the radio buttons under language.

  <%= form_for(@book) do |f| %>
  <% if @book.errors.any? %>
    <div id="error_explanation">
      <h2><%= pluralize(@book.errors.count, "error") %> prohibited this book from being saved:</h2>

      <ul>
      <% @book.errors.full_messages.each do |msg| %>
        <li><%= msg %></li>
      <% end %>
      </ul>
    </div>
  <% end %>

  <div class="field">
    <%= f.label :title %><br />
    <%= f.text_field :title %>
  </div>
  <div class="field">
    <%= f.label :author %><br />
    <%= f.text_field :author %>
  </div>
  <div class="field">
    <%= f.label :publication_date %><br />
    <%= f.date_select :publication_date,
    		      :start_date => 1900,
    		      :end_date => (Time.now.year+2) %>
  </div>
  <div class="field">
    <%= f.label :length %><br />
    <%= f.number_field :length %>
  </div>
  <div class="field">
    <%= f.label :language %><br />
    <%= radio_button_tag :'language', 'english' %> English
    <%= radio_button_tag :'language', 'french' %> French
    <%= radio_button_tag :'language', 'spanish' %> Spanish
    <%= radio_button_tag :'language', 'german' %> German
  </div>
  <div class="actions">
    <%= f.submit %>
  </div>
<% end %>