Use consistent naming to fix translation in error message

app/views/ldap_auth_sources/_form.rhtml

@@ -26,7 +26,7 @@
 <p><label for="auth_source_onthefly_register"><%=l(:field_onthefly)%></label>
 <%= check_box 'auth_source', 'onthefly_register' %></p>
 
-<p><label for="auth_source_custom_filter"><%=l(:field_custom_ldap_filter)%></label>
+<p><label for="auth_source_custom_filter"><%=l(:field_custom_filter)%></label>
 <%= text_field 'auth_source', 'custom_filter', :size => 60 %></p>
 </div>
 

config/locales/en.yml

@@ -307,7 +307,7 @@ en:
   field_text: Text field
   field_visible: Visible
   field_warn_on_leaving_unsaved: "Warn me when leaving a page with unsaved text"
-  field_custom_ldap_filter: Custom LDAP filter
+  field_custom_filter: Custom LDAP filter
 
   setting_app_title: Application title
   setting_app_subtitle: Application subtitle