UI translation: now addons' authors have all needed tools to manage their own translations.
* Update: update (or create) an addon's translation data (as some py code).
* Export PO: export an addon's translation data in a set of pot/po's files.
* Import PO: import a set of po's files to update an addon's translations.

Note: current i18n doc on wiki is completely outdated, I will try to fix this in following days.

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4481 96b784f8-4ae3-dd11-aff7-0030488c597c
French translations for render_copy_settings! ;)

git-svn-id: https://svn.blender.org/svnroot/bf-extensions/trunk/py/scripts/addons@4482 96b784f8-4ae3-dd11-aff7-0030488c597c