To be displayed correctly on odoo app (In a given category and not only in all or hidden)
the module category in the __openerp__.py file should be one of these:
"Accounting",
"Discuss",
"Document Management",
"eCommerce",
"Human Resources",
"Industries",
"Localization",
"Manufacturing",
"Marketing",
"Point of Sale",
"Productivity",
"Project",
"Purchases",
"Sales",
"Warehouse",
"Website",
"Extra Tools",
'Accounting & Finance' will not work, as 'Project Management', ...