When adding a new LDAP authentication source, none of the form labels have been translated. The field method in layout_helper calls s_() on the gettext Model|Field string, but this doesn't work well with STI, returning the subclass name while the translation extraction uses the base STI class name.

    122:   content_tag :div, :class => "control-group #{fluid ? "row-fluid" : ""} #{error.empty? ? "" : 'error'}" do
 => 123:     binding.pry
    124:     label   = options.delete(:label)
    125:     label ||= (f.object.class.respond_to?(:gettext_translation_for_attribute_name) &&
    126:                 s_(f.object.class.gettext_translation_for_attribute_name attr)) if f

[3] pry(#<#<Class:0x007f97e985cd60>>)> f.object.class.gettext_translation_for_attribute_name attr
=> "AuthSourceLdap|Tls" 

While the model attributes file is based off of the schema which doesn't have STI subclass names:

$ grep AuthSource locale/model_attributes.rb  | tail -3
_('AuthSource|Onthefly register')
_('AuthSource|Port')
_('AuthSource|Tls')