be a bit more generic regarding the ID of translalted content
don't fail if buttons_babel_view_up_to_nr_translations has not been set yet
added more check=False  to forInterface calls (registry), in case there are missing records
and finally, also make translate not fail when there are missing records in the registry
add new contol-panel setting rename_translation_from_title (Bool)
be more generic about the id of translated items (so that the test works both with renaming turned on
(default) and off)
added a doctest for the renaming functionality
better example text
updated HISTORY
Merge pull request #38 from pysailor/rename-translation

Rename translations based on their title, fixes #27, #28.