diff --git a/addons/account_analytic_plans/account_analytic_plans.py b/addons/account_analytic_plans/account_analytic_plans.py
index f701b737d7b..505aaf232ed 100644
--- a/addons/account_analytic_plans/account_analytic_plans.py
+++ b/addons/account_analytic_plans/account_analytic_plans.py
@@ -218,7 +218,7 @@ class account_analytic_plan_instance(osv.osv):
 
             pids = ana_plan_instance_obj.search(cr, uid, [('name','=',vals['name']), ('code','=',vals['code']), ('plan_id','<>',False)], context=context)
             if pids:
-                raise osv.except_osv(_('Error!'), _('A model having same name and code.'))
+                raise osv.except_osv(_('Error!'), _('A model having this name and code already exists !'))
 
             res = acct_anal_plan_line_obj.search(cr, uid, [('plan_id','=',journal.plan_id.id)], context=context)
             for i in res:
diff --git a/addons/account_analytic_plans/i18n/account_analytic_plans.pot b/addons/account_analytic_plans/i18n/account_analytic_plans.pot
index b36f4db2087..75b4654850e 100644
--- a/addons/account_analytic_plans/i18n/account_analytic_plans.pot
+++ b/addons/account_analytic_plans/i18n/account_analytic_plans.pot
@@ -183,7 +183,7 @@ msgstr ""
 #. module: account_analytic_plans
 #: code:addons/account_analytic_plans/account_analytic_plans.py:221
 #, python-format
-msgid "A model having same name and code."
+msgid "A model having this name and code already exists !"
 msgstr ""
 
 #. module: account_analytic_plans
diff --git a/addons/document/document.py b/addons/document/document.py
index a8994992717..27abb92c80c 100644
--- a/addons/document/document.py
+++ b/addons/document/document.py
@@ -61,7 +61,7 @@ class document_file(osv.osv):
             return False
 
         if ids is not None:
-            raise NotImplementedError("Ids is just there by convention,please donot use it yet.")
+            raise NotImplementedError("Ids is just there by convention,please do not use it.")
 
         cr.execute("UPDATE ir_attachment " \
                     "SET parent_id = %s, db_datas = decode(encode(db_datas,'escape'), 'base64') " \
diff --git a/addons/event/event.py b/addons/event/event.py
index e8c6eb31e3e..114432493a5 100644
--- a/addons/event/event.py
+++ b/addons/event/event.py
@@ -365,7 +365,7 @@ class event_registration(osv.osv):
                 self.write(cr, uid, ids, values)
                 self.message_append(cr, uid, ids, _('State set to Done'), body_text=_('Done'))
             else:
-                raise osv.except_osv(_('Error!'),_("You must wait the event starting day to do this action.") )
+                raise osv.except_osv(_('Error!'),_("You must wait for the starting day of the event to do this action.") )
         return True
 
     def button_reg_cancel(self, cr, uid, ids, context=None, *args):
diff --git a/addons/google_base_account/i18n/google_base_account.pot b/addons/google_base_account/i18n/google_base_account.pot
index 5a56073a7e7..41693f54adf 100644
--- a/addons/google_base_account/i18n/google_base_account.pot
+++ b/addons/google_base_account/i18n/google_base_account.pot
@@ -106,7 +106,7 @@ msgstr ""
 #. module: google_base_account
 #: code:addons/google_base_account/wizard/google_login.py:75
 #, python-format
-msgid "Authentication fail check the user and password !"
+msgid "Authentication failed check the user and password !"
 msgstr ""
 
 #. module: google_base_account
diff --git a/addons/google_base_account/wizard/google_login.py b/addons/google_base_account/wizard/google_login.py
index b6cb4f185b9..756657f001f 100644
--- a/addons/google_base_account/wizard/google_login.py
+++ b/addons/google_base_account/wizard/google_login.py
@@ -74,7 +74,7 @@ class google_login(osv.osv_memory):
             }
             self.pool.get('res.users').write(cr, uid, uid, res, context=context)
         else:
-            raise osv.except_osv(_('Error'), _("Authentication fail check the user and password !"))
+            raise osv.except_osv(_('Error'), _("Authentication failed check the user and password !"))
 
         return self._get_next_action(cr, uid, context=context)
 
diff --git a/addons/hr_attendance/hr_attendance.py b/addons/hr_attendance/hr_attendance.py
index ab370f63397..16f3530c1e9 100644
--- a/addons/hr_attendance/hr_attendance.py
+++ b/addons/hr_attendance/hr_attendance.py
@@ -137,7 +137,7 @@ class hr_employee(osv.osv):
             warning_sign = "Sign Out"
         for emp in self.read(cr, uid, ids, ['id'], context=context):
             if not self._action_check(cr, uid, emp['id'], dt, context):
-                raise osv.except_osv(_('Warning !'), _('You try to %s with a date before to another event !\nTry to contact the administrator to correct attendances.')%(warning_sign,))
+                raise osv.except_osv(_('Warning !'), _('You tried to %s with a date anterior to another event !\nTry to contact the administrator to correct attendances.')%(warning_sign,))
 
             res = {'action': type, 'employee_id': emp['id']}
             if dt:
diff --git a/addons/hr_contract/hr_contract.py b/addons/hr_contract/hr_contract.py
index 07742ed5fe4..90f42d8487a 100644
--- a/addons/hr_contract/hr_contract.py
+++ b/addons/hr_contract/hr_contract.py
@@ -97,7 +97,7 @@ class hr_contract(osv.osv):
         return True
 
     _constraints = [
-        (_check_dates, 'Error! Contract start-date must be lower then contract end-date.', ['date_start', 'date_end'])
+        (_check_dates, 'Error! Contract start-date must be less than contract end-date.', ['date_start', 'date_end'])
     ]
 hr_contract()
 
diff --git a/addons/hr_contract/i18n/hr_contract.pot b/addons/hr_contract/i18n/hr_contract.pot
index 016fef341ae..f444a602208 100644
--- a/addons/hr_contract/i18n/hr_contract.pot
+++ b/addons/hr_contract/i18n/hr_contract.pot
@@ -234,7 +234,7 @@ msgstr ""
 
 #. module: hr_contract
 #: constraint:hr.contract:0
-msgid "Error! Contract start-date must be lower then contract end-date."
+msgid "Error! Contract start-date must be less than contract end-date."
 msgstr ""
 
 #. module: hr_contract
diff --git a/addons/hr_evaluation/hr_evaluation.py b/addons/hr_evaluation/hr_evaluation.py
index d3e410bab1c..decdf56eb47 100644
--- a/addons/hr_evaluation/hr_evaluation.py
+++ b/addons/hr_evaluation/hr_evaluation.py
@@ -240,7 +240,7 @@ class hr_evaluation(osv.osv):
         self.write(cr, uid, ids, {'state':'progress'}, context=context)
         for id in self.browse(cr, uid, ids, context=context):
             if len(id.survey_request_ids) != len(request_obj.search(cr, uid, [('evaluation_id', '=', id.id),('state', 'in', ['done','cancel'])], context=context)):
-                raise osv.except_osv(_('Warning !'),_("You cannot change state, because some appraisal in waiting answer or draft state."))
+                raise osv.except_osv(_('Warning !'),_("You cannot change state, because some appraisal(s) are in waiting answer or draft state."))
         return True
 
     def button_done(self,cr, uid, ids, context=None):
diff --git a/addons/hr_evaluation/i18n/hr_evaluation.pot b/addons/hr_evaluation/i18n/hr_evaluation.pot
index c6c8e63dd72..0b52d0ced50 100644
--- a/addons/hr_evaluation/i18n/hr_evaluation.pot
+++ b/addons/hr_evaluation/i18n/hr_evaluation.pot
@@ -812,7 +812,7 @@ msgstr ""
 #: code:addons/hr_evaluation/hr_evaluation.py:244
 #, python-format
 msgid ""
-"You cannot change state, because some appraisal in waiting answer or draft."
+"You cannot change state, because some appraisal(s) are in waiting answer or draft state."
 "state"
 msgstr ""