Interface translation of custom fields When I translate field labels via admin/config/regional/translate/translate then my changes are happening in the frontend - but this does not work for fields which I created myself. Those fields are available for translation in the same spot but changes to them have no effect - it always uses the original text. 

In my case it's about some additional fields in the registration form. I have de/user/register and fr/user/register and the pre-existing fields are in the correct language and if I do changes to them, then they are applied. But if I provide translations for the fields which I added, then they just don't show up. 

I am using Drupal 7.14. On the picture, you see the custom field "wohnort". The first one has been there right after the creation of the custom field; the second one only after the Field Translation module and the i18n pack.
Here is Internationalization pack for building multilingual sites in Drupal: i18n.
To translate field labels you need “Field translation” module from this pack. After you enable it new tab “Translate” appears on field edit page.  



Update

That's strange that you can see your field labels on admin/config/regional/translate/translate page, so I started an issue #1672694. I think it's a bug.

Update 2

Fixed since Drupal 7.22