[FIX] server: db service, fix the filestore copy when duplicating a database
[IMP] l10n_cn: upgrade to 1.8, including small business chart

Also removed empty translation files.

This is a manual rebase of PR #802
Merge pull request #823 from sebalix/master-fix-db-duplicate

[FIX] dbmanager duplicate db, use shutil.copytree to duplicate the filestore
[IMP] module loading and tests profiling

Add a loglevel 25 to log some INFO to runbot
Add timers for loading and testing
Silence empty test suite
Merge upstream