Add ability to take GPX storage offline.

app/views/trace/_trace.html.erb

@@ -1,10 +1,12 @@
 <tr>
   <% cl = cycle('table0', 'table1') %>
   <td class="<%= cl %>">
-    <% if trace.inserted %>
-      <a href="<%= url_for :controller => 'trace', :action => 'view', :id => trace.id, :display_name => trace.user.display_name %>"><img src="<%= url_for :controller => 'trace', :action => 'icon', :id => trace.id, :display_name => trace.user.display_name %>" border="0" alt="" /></a>
-    <% else %>
-      <span style="color:red"><%= t'trace.trace.pending' %></span>
+    <% if OSM_STATUS != :gpx_offline %>
+      <% if trace.inserted %>
+        <a href="<%= url_for :controller => 'trace', :action => 'view', :id => trace.id, :display_name => trace.user.display_name %>"><img src="<%= url_for :controller => 'trace', :action => 'icon', :id => trace.id, :display_name => trace.user.display_name %>" border="0" alt="" /></a>
+      <% else %>
+        <span style="color:red"><%= t'trace.trace.pending' %></span>
+      <% end %>
     <% end %>
   </td>
   <td class="<%= cl %>"><%= link_to trace.name, {:controller => 'trace', :action => 'view', :display_name => trace.user.display_name, :id => trace.id} %>

app/views/trace/offline.html.erb

@@ -0,0 +1,2 @@
+<h2><%= t 'trace.offline.heading' %></h2>
+<p><%= t 'trace.offline.message' %></p>

app/views/trace/view.html.erb

@@ -1,10 +1,12 @@
 <h2><%= t 'trace.view.heading', :name => h(@trace.name) %></h2>
 
+<% if OSM_STATUS != :gpx_offline %>
   <% if @trace.inserted %>
     <img src="<%= url_for :controller => 'trace', :action => 'picture', :id => @trace.id, :display_name => @trace.user.display_name %>">
   <% else %>
     <span style="color:red"><%= t'trace.view.pending' %></span>
   <% end %>
+<% end %>
 
 <table border="0">
   <tr>