Py API doc generation: add bpy.app.translations module, and fix a few errors found while building the doc. Thanks to Campbell for review.

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56166 954f8c5b-7b00-dc11-b283-0030488c597c
More fix (cleanup) to r56063: remove call to RNA_create_pointer, it has already been called by uiButGetOperatorPtrRNA() if needed.

(I thought it would also copy idproperties, but as it does not...).

git-svn-id: https://svn.blender.org/svnroot/bf-blender/trunk/blender@56167 954f8c5b-7b00-dc11-b283-0030488c597c