diff --git a/cfp/views.py b/cfp/views.py
index cb78971..d688fbf 100644
--- a/cfp/views.py
+++ b/cfp/views.py
@@ -120,7 +120,7 @@ def volunteer_mail_token(request):
                 subject=_("[%(conference)s] Someone asked to access your profil") % {'conference': request.conference},
                 content=body,
             )
-            messages.success(request, _('A email have been sent with a link to access to your profil.'))
+            messages.success(request, _('An email has been sent with a link to access to your profil.'))
             return redirect(reverse('volunteer-mail-token'))
     return render(request, 'cfp/volunteer_mail_token.html', {
         'form': form,
@@ -331,7 +331,7 @@ Thanks!
             },
             content=body,
         )
-        messages.success(request, _('Your proposition have been successfully submitted!'))
+        messages.success(request, _('Your proposition has been successfully submitted!'))
         return redirect(reverse('proposal-talk-details', kwargs=dict(speaker_token=speaker.token, talk_id=talk.pk)))
     return render(request, 'cfp/proposal_home.html', {
         'speaker_form': speaker_form,
@@ -372,7 +372,7 @@ Sincerely,
                 },
                 content=body,
             )
-            messages.success(request, _('A email have been sent with a link to access to your profil.'))
+            messages.success(request, _('An email has been sent with a link to access to your profil.'))
             return redirect(reverse('proposal-mail-token'))
     return render(request, 'cfp/proposal_mail_token.html', {
         'form': form,
@@ -414,7 +414,7 @@ def proposal_talk_edit(request, speaker, talk_id=None):
         else:
             # TODO: it could be great to receive the proposition by mail
             # but this is not crucial as the speaker already have a link in its mailbox
-            messages.success(request, _('Your proposition have been successfully submitted!'))
+            messages.success(request, _('Your proposition has been successfully submitted!'))
         return redirect(reverse('proposal-talk-details', kwargs=dict(speaker_token=speaker.token, talk_id=talk.pk)))
     return render(request, 'cfp/proposal_talk_form.html', {
         'speaker': speaker,
@@ -584,17 +584,17 @@ def talk_acknowledgment(request, talk_id, confirm):
     talk.confirmed = confirm
     talk.save()
     if confirm:
-        confirmation_message= _('The speaker confirmation have been noted.')
+        confirmation_message= _('The speaker confirmation has been noted.')
         action = _('confirmed')
-        thread_note = _('The talk have been confirmed.')
+        thread_note = _('The talk has been confirmed.')
     else:
-        confirmation_message = _('The speaker unavailability have been noted.')
+        confirmation_message = _('The speaker unavailability has been noted.')
         action = _('cancelled')
-    thread_note = _('The talk have been %(action)s.') % {'action': action}
+    thread_note = _('The talk has been %(action)s.') % {'action': action}
     send_message(
         thread=talk.conversation,
         author=request.user,
-        subject=_("[%(conference)s] The talk '%(talk)s' have been %(action)s.") % {
+        subject=_("[%(conference)s] The talk '%(talk)s' has been %(action)s.") % {
             'conference': request.conference,
             'talk': talk,
             'action': action,
@@ -695,7 +695,7 @@ def talk_list(request):
                 send_message(
                     thread=talk.conversation,
                     author=request.user,
-                    subject=_("[%(conference)s] The talk '%(talk)s' have been %(action)s") % {
+                    subject=_("[%(conference)s] The talk '%(talk)s' has been %(action)s") % {
                         'conference': request.conference,
                         'talk': talk,
                         'action': action,
@@ -830,7 +830,7 @@ def talk_decide(request, talk_id, accept):
                 send_message(
                     thread=participant.conversation,
                     author=request.conference,
-                    subject=_("[%(conference)s] Your talk '%(talk)s' have been %(action)s") % {
+                    subject=_("[%(conference)s] Your talk '%(talk)s' has been %(action)s") % {
                         'conference': request.conference,
                         'talk': talk,
                         'action': action,
@@ -841,7 +841,7 @@ def talk_decide(request, talk_id, accept):
         send_message(
             thread=talk.conversation,
             author=request.user,
-            subject=_("[%(conference)s] The talk '%(talk)s' have been %(action)s") % {
+            subject=_("[%(conference)s] The talk '%(talk)s' has been %(action)s") % {
                 'conference': request.conference,
                 'talk': talk,
                 'action': action,
diff --git a/doc/installation-guide.rst b/doc/installation-guide.rst
index 572f39e..845355f 100644
--- a/doc/installation-guide.rst
+++ b/doc/installation-guide.rst
@@ -12,7 +12,7 @@ Commands starting with ``$`` must be run as ``ponyconf`` user.
 Requirements
 ------------
 
-PonyConf have been tested with python 3.5 and 3.6.
+PonyConf has been tested with python 3.5 and 3.6.
 
 
 Preparation