translate: port to pythonic logging, filename in a message
translate: port to pythonic logging, filename in a message

It is good to know which .po file we are currently loading.
Warning: some messages moved from the 'db' logger to the 'i18n' one.

splbio/openobject-server,splbio/openobject-server,gisce/openobject-server,vnc-biz/openerp-server,splbio/openobject-server,ovnicraft/openerp-server,ovnicraft/openerp-server,gisce/openobject-server,vnc-biz/openerp-server,MarkusTeufelberger/openobject-server,MarkusTeufelberger/openobject-server,MarkusTeufelberger/openobject-server,gisce/openobject-server