diff --git a/app/mailers/user_mailer.rb b/app/mailers/user_mailer.rb
index 246602b..ba4ca5b 100644
--- a/app/mailers/user_mailer.rb
+++ b/app/mailers/user_mailer.rb
@@ -16,7 +16,7 @@
     @user = user
     FastGettext.with_locale FastGettext.default_locale do
       mail(to: @role.user.email, 
-           subject: _('%{user_name} has shared a Data Management Plan with you in %{tool_name}') %{ 
+           subject: d_('dmpopidor', '%{user_name} has shared a Data Management Plan with you in %{tool_name}') %{ 
              :user_name => @user.invited_by.name(false),
              :tool_name => Rails.configuration.branding[:application][:name]
             })
diff --git a/app/models/user.rb b/app/models/user.rb
index 065e740..c4a3ebb 100644
--- a/app/models/user.rb
+++ b/app/models/user.rb
@@ -281,7 +281,7 @@
   # Override devise_invitable email title
   # --------------------------------------------------------------
   def deliver_invitation(options = {})
-    super(options.merge(subject: _('%{user_name} has shared a Data Management Plan with you in %{tool_name}') % {
+    super(options.merge(subject: d_('dmpopidor', '%{user_name} has shared a Data Management Plan with you in %{tool_name}') % {
       user_name: self.invited_by.name(false),
       tool_name: Rails.configuration.branding[:application][:name]
       }))
diff --git a/app/views/devise/mailer/invitation_instructions.html.erb b/app/views/devise/mailer/invitation_instructions.html.erb
index c9aef47..319de78 100644
--- a/app/views/devise/mailer/invitation_instructions.html.erb
+++ b/app/views/devise/mailer/invitation_instructions.html.erb
@@ -11,7 +11,7 @@
     <%= _('Hello %{user_email}') %{ :user_email => @resource.email } %>
   </p>
   <p>
-  <%= _('%{sender_name} has invited you to contribute to their Data Management Plan in %{tool_name}') %{ 
+  <%= d_('dmpopidor', '%{sender_name} has invited you to contribute to their Data Management Plan in %{tool_name}') %{ 
     :sender_name => sender_name,
     :tool_name => tool_name
      }%>
diff --git a/app/views/user_mailer/sharing_notification.html.erb b/app/views/user_mailer/sharing_notification.html.erb
index 3c555d4..996df91 100644
--- a/app/views/user_mailer/sharing_notification.html.erb
+++ b/app/views/user_mailer/sharing_notification.html.erb
@@ -9,7 +9,7 @@
     <%= _('Hello %{user_email}') %{ :user_email => user_email } %>
   </p>
   <p>
-    <%= _('%{sender_name} has invited you to contribute to their Data Management Plan in %{tool_name}') %{ 
+    <%= d_('dmpopidor', '%{sender_name} has invited you to contribute to their Data Management Plan in %{tool_name}') %{ 
       :sender_name => sender_name,
       :tool_name => tool_name
        }%>