[FIX] hr_timesheet: add missing import (bis)

addons/hr_timesheet/models/project.py

@@ -3,6 +3,7 @@
 
 from odoo import models, fields, api
 from odoo.exceptions import UserError
+from odoo.tools.translate import _
 
 
 class Project(models.Model):
@@ -42,7 +43,6 @@ class Task(models.Model):
         for task in self:
             task.subtask_effective_hours = sum(child_task.effective_hours + child_task.subtask_effective_hours for child_task in task.child_ids)
 
-
     @api.multi
     def write(self, values):
         result = super(Task, self).write(values)