Don't split notification_reason_text

With notification_reason_text we weren't adding the reason to the
translation and the reason was adding also a preposition (on) to
describe the reason as well

app/helpers/emails_helper.rb

@@ -112,20 +112,20 @@ module EmailsHelper
     end
   end
 
-  # "You are receiving this email because #{reason}"
+  # "You are receiving this email because #{reason} on #{gitlab_host}."
   def notification_reason_text(reason)
-    string = case reason
-             when NotificationReason::OWN_ACTIVITY
-               'of your activity'
-             when NotificationReason::ASSIGNED
-               'you have been assigned an item'
-             when NotificationReason::MENTIONED
-               'you have been mentioned'
-             else
-               'of your account'
-             end
-
-    "#{string} on #{Gitlab.config.gitlab.host}"
+    gitlab_host = Gitlab.config.gitlab.host
+
+    case reason
+    when NotificationReason::OWN_ACTIVITY
+      _("You're receiving this email because of your activity on %{host}.") % { host: gitlab_host }
+    when NotificationReason::ASSIGNED
+      _("You're receiving this email because you have been assigned an item on %{host}.") % { host: gitlab_host }
+    when NotificationReason::MENTIONED
+      _("You're receiving this email because you have been mentioned on %{host}.") % { host: gitlab_host }
+    else
+      _("You're receiving this email because of your account on %{host}.") % { host: gitlab_host }
+    end
   end
 
   def create_list_id_string(project, list_id_max_length = 255)

app/views/layouts/notify.html.haml

@@ -20,7 +20,7 @@
             #{link_to _("View it on GitLab"), @target_url}.
           %br
           -# Don't link the host in the line below, one link in the email is easier to quickly click than two.
-          = _("You're receiving this email because %{reason}.") % { reason: notification_reason_text(@reason) }
+          = notification_reason_text(@reason)
           If you'd like to receive fewer emails, you can
           - if @labels_url
             adjust your #{link_to 'label subscriptions', @labels_url}.

app/views/layouts/notify.text.erb

@@ -11,7 +11,7 @@
 <%    end -%>
 <%  end -%>
 
-<%= "You're receiving this email because #{notification_reason_text(@reason)}." %>
+<%= notification_reason_text(@reason) %>
 <%= render_if_exists 'layouts/mailer/additional_text' %>
 
 <%= text_footer_message -%>

locale/gitlab.pot

@@ -20306,15 +20306,21 @@ msgstr ""
 msgid "You're only seeing %{startTag}other activity%{endTag} in the feed. To add a comment, switch to one of the following options."
 msgstr ""
 
-msgid "You're receiving this email because %{reason}."
-msgstr ""
-
 msgid "You're receiving this email because of your account on %{host}."
 msgstr ""
 
 msgid "You're receiving this email because of your account on %{host}. %{manage_notifications_link} · %{help_link}"
 msgstr ""
 
+msgid "You're receiving this email because of your activity on %{host}."
+msgstr ""
+
+msgid "You're receiving this email because you have been assigned an item on %{host}."
+msgstr ""
+
+msgid "You're receiving this email because you have been mentioned on %{host}."
+msgstr ""
+
 msgid "You've already enabled two-factor authentication using one time password authenticators. In order to register a different device, you must first disable two-factor authentication."
 msgstr ""
 

spec/helpers/emails_helper_spec.rb

@@ -74,6 +74,28 @@ describe EmailsHelper do
     end
   end
 
+  describe 'notification_reason_text' do
+    subject { helper.notification_reason_text(reason_code) }
+
+    using RSpec::Parameterized::TableSyntax
+
+    where(:reason_code, :reason_text) do
+      NotificationReason::OWN_ACTIVITY | ' of your activity '
+      NotificationReason::ASSIGNED     | ' you have been assigned an item '
+      NotificationReason::MENTIONED    | ' you have been mentioned '
+      ""                               | ' of your account '
+      nil                              | ' of your account '
+    end
+
+    with_them do
+      it { is_expected.to start_with "You're receiving this email because" }
+
+      it { is_expected.to include reason_text }
+
+      it { is_expected.to end_with "on #{Gitlab.config.gitlab.host}." }
+    end
+  end
+
   describe 'sanitize_name' do
     context 'when name contains a valid URL string' do
       it 'returns name with `.` replaced with `_` to prevent mail clients from auto-linking URLs' do