[FIX] hr_holidays: better display of leave counter (opw 605016)

The number of leave requests left is based on the employee_id key in the context, when displaying the status of an hr.holidays we don't have the information in the name_get of the hr.holidays.status.
The fallback on the number of employees is done with the uid but we can not rely on it as well as the name_get on m2o field is done with superuser_id.
[FIX] product: when duplicating a product, keep the language in the context

At the time of the context_wo_lang patch (7.0 revision 6577), the orm did not keep the language in copy_data, this patch intended to be more consistent.
Since server revision 5146 7.0, the new behaviour is to use the translated version in copy_data. Removign this change will be more consistent with the orm.

The expected behaviour is now the following:
In user lang: translated product name + translated '(copy)'
In other lang: same as original product
[FIX] product: when duplicating a product, keep the language in the context

At the time of the context_wo_lang patch (7.0 revision 6577), the orm did not keep the language in copy_data, this patch intended to be more consistent.
Since server revision 5146 7.0, the new behaviour is to use the translated version in copy_data. Removign this change will be more consistent with the orm.

The expected behaviour is now the following:
In user lang: translated product name + translated '(copy)'
In other lang: same as original product