Fix greek translations.
Fix greek translations.

STOCK_* is a reference to icons, should never be translated.
Fix some other strings, too.

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