[IMP] hr_holidays: Fix time off plural labels

Purpose
=======

The noun time off is uncountable. The plural form of time off is also time off.

closes odoo/odoo#51370

Signed-off-by: Yannick Tivisse (yti) <yti@odoo.com>

addons/hr_holidays/models/hr_leave.py

@@ -542,7 +542,7 @@ class HolidaysRequest(models.Model):
             ]
             nholidays = self.search_count(domain)
             if nholidays:
-                raise ValidationError(_('You can not set 2 times off that overlaps on the same day for the same employee.'))
+                raise ValidationError(_('You can not set 2 time off that overlaps on the same day for the same employee.'))
 
     @api.constrains('state', 'number_of_days', 'holiday_status_id')
     def _check_holidays(self):

addons/hr_holidays/models/hr_leave_type.py

@@ -73,7 +73,7 @@ class HolidaysType(models.Model):
     company_id = fields.Many2one('res.company', string='Company', default=lambda self: self.env.company)
     responsible_id = fields.Many2one('res.users', 'Responsible',
         domain=lambda self: [('groups_id', 'in', self.env.ref('hr_holidays.group_hr_holidays_user').id)],
-        help="This user will be responsible for approving this type of times off. "
+        help="This user will be responsible for approving this type of time off. "
         "This is only used when validation is 'hr' or 'both'",)
     leave_validation_type = fields.Selection([
         ('no_validation', 'No Validation'),

addons/hr_holidays/static/src/js/time_off_calendar.js

@@ -42,7 +42,7 @@ odoo.define('hr_holidays.dashboard.view_custo', function(require) {
 
          /**
          * Render the buttons and add new button about
-         * times off and allocations request
+         * time off and allocations request
          *
          * @override
          */