[FIX] hr_timesheet_sheet: Display warning in user's language

Closes https://github.com/odoo/odoo/pull/17254/files

addons/hr_timesheet_sheet/i18n/hr_timesheet_sheet.pot

@@ -466,6 +466,13 @@ msgstr ""
 msgid "You cannot duplicate a timesheet."
 msgstr ""
 
+#. module: hr_timesheet_sheet
+#: code:addons/hr_timesheet_sheet/models/hr_timesheet_sheet.py:85
+#, python-format
+msgid "You cannot have 2 timesheets that overlap!\n"
+"Please use the menu 'My Current Timesheet' to avoid this problem."
+msgstr ""
+
 #. module: hr_timesheet_sheet
 #: code:addons/hr_timesheet_sheet/models/account_analytic_line.py:60
 #, python-format

addons/hr_timesheet_sheet/models/hr_timesheet_sheet.py

@@ -85,7 +85,7 @@ class HrTimesheetSheet(models.Model):
                         AND id <> %s''',
                     (sheet.date_to, sheet.date_from, new_user_id, sheet.id))
                 if any(self.env.cr.fetchall()):
-                    raise ValidationError('You cannot have 2 timesheets that overlap!\nPlease use the menu \'My Current Timesheet\' to avoid this problem.')
+                    raise ValidationError(_('You cannot have 2 timesheets that overlap!\nPlease use the menu \'My Current Timesheet\' to avoid this problem.'))
 
     @api.onchange('employee_id')
     def onchange_employee_id(self):