diff --git a/addons/hr/hr.py b/addons/hr/hr.py
index 9613c2376fa..2cc1c05105b 100644
--- a/addons/hr/hr.py
+++ b/addons/hr/hr.py
@@ -65,7 +65,7 @@ class hr_employee_category(osv.osv):
         return True
 
     _constraints = [
-        (_check_recursion, 'Error ! You cannot create recursive Categories.', ['parent_id'])
+        (_check_recursion, _('Error ! You cannot create recursive Categories.'), ['parent_id'])
     ]
 
 hr_employee_category()
@@ -208,8 +208,8 @@ class hr_employee(osv.osv):
         return True
 
     _constraints = [
-        (_check_recursion, 'Error ! You cannot create recursive Hierarchy of Employees.', ['parent_id']),
-        (_check_department_id, 'Error ! You cannot select a department for which the employee is the manager.', ['department_id']),
+        (_check_recursion, _('Error ! You cannot create recursive Hierarchy of Employees.'), ['parent_id']),
+        (_check_department_id, _('Error ! You cannot select a department for which the employee is the manager.'), ['department_id']),
     ]
 
 hr_employee()
diff --git a/addons/hr/hr_department.py b/addons/hr/hr_department.py
index 8e1d11716c2..ef2024c4e71 100644
--- a/addons/hr/hr_department.py
+++ b/addons/hr/hr_department.py
@@ -21,6 +21,7 @@
 
 from osv import fields, osv
 import tools
+from tools.translate import _
 
 class hr_department(osv.osv):
     def name_get(self, cr, uid, ids, context=None):
@@ -80,7 +81,7 @@ class hr_department(osv.osv):
         return True
 
     _constraints = [
-        (_check_recursion, 'Error! You can not create recursive departments.', ['parent_id'])
+        (_check_recursion, _('Error! You can not create recursive departments.'), ['parent_id'])
     ]
 
 hr_department()
diff --git a/addons/hr_attendance/hr_attendance.py b/addons/hr_attendance/hr_attendance.py
index c51406f19de..ce830c59a42 100644
--- a/addons/hr_attendance/hr_attendance.py
+++ b/addons/hr_attendance/hr_attendance.py
@@ -85,7 +85,7 @@ class hr_attendance(osv.osv):
                 return False
         return True
 
-    _constraints = [(_altern_si_so, 'Error: Sign in (resp. Sign out) must follow Sign out (resp. Sign in)', ['action'])]
+    _constraints = [(_altern_si_so, _('Error: Sign in (resp. Sign out) must follow Sign out (resp. Sign in)'), ['action'])]
     _order = 'name desc'
 
 hr_attendance()
diff --git a/addons/hr_holidays/hr_holidays.py b/addons/hr_holidays/hr_holidays.py
index b2b4c52865e..83ce70b6901 100644
--- a/addons/hr_holidays/hr_holidays.py
+++ b/addons/hr_holidays/hr_holidays.py
@@ -257,7 +257,7 @@ class hr_holidays(osv.osv):
                 return False
         return True
 
-    _constraints = [(_check_date, 'Start date should not be larger than end date!\nNumber of Days should be greater than 1!', ['number_of_days_temp'])]
+    _constraints = [(_check_date, _('Start date should not be larger than end date!\nNumber of Days should be greater than 1!'), ['number_of_days_temp'])]
 
     def unlink(self, cr, uid, ids, context=None):
         if context is None:
diff --git a/addons/hr_payroll/hr_payroll.py b/addons/hr_payroll/hr_payroll.py
index 77afdf15676..3ef3fdfad64 100644
--- a/addons/hr_payroll/hr_payroll.py
+++ b/addons/hr_payroll/hr_payroll.py
@@ -77,7 +77,7 @@ class hr_passport(osv.osv):
         'note': fields.text('Description'),
     }
     _sql_constraints = [
-        ('passport_no_uniq', 'unique (employee_id, name)', 'The Passport No must be unique !'),
+        ('passport_no_uniq', _('unique (employee_id, name)'), 'The Passport No must be unique !'),
     ]
 hr_passport()
 
diff --git a/addons/hr_timesheet_sheet/hr_timesheet_sheet.py b/addons/hr_timesheet_sheet/hr_timesheet_sheet.py
index c780951d07e..31b23f0c6b1 100644
--- a/addons/hr_timesheet_sheet/hr_timesheet_sheet.py
+++ b/addons/hr_timesheet_sheet/hr_timesheet_sheet.py
@@ -369,8 +369,8 @@ class hr_timesheet_sheet(osv.osv):
 
 
     _constraints = [
-        (_sheet_date, 'You can not have 2 timesheets that overlaps !\nPlease use the menu \'My Current Timesheet\' to avoid this problem.', ['date_from','date_to']),
-        (_date_current_check, 'You must select a Current date which is in the timesheet dates !', ['date_current']),
+        (_sheet_date, _('You can not have 2 timesheets that overlaps !\nPlease use the menu \'My Current Timesheet\' to avoid this problem.'), ['date_from','date_to']),
+        (_date_current_check, _('You must select a Current date which is in the timesheet dates !'), ['date_current']),
     ]
 
     def action_set_to_draft(self, cr, uid, ids, *args):