translation.module

-  Fixed problem with term translation form
-  Improved api functions: translation_node_nid and translation_term_tid
i18n.module
- Added fieldset in vocabulary forms to support some experimental modules
New folder: experimental
+ i18nstrings.module, generalized support for configurable strings translation
+ i18ncontent.module, content type names and texts translation
+ i18nsync.module, synchronize taxonomy for translations
+ ttext.module, translatable text field for CCK