Add missing translations of export issues

Add missing translations of export issues feature

app/controllers/projects/issues_controller.rb

@@ -193,7 +193,8 @@ class Projects::IssuesController < Projects::ApplicationController
     ExportCsvWorker.perform_async(current_user.id, project.id, finder_options.to_h) # rubocop:disable CodeReuse/Worker
 
     index_path = project_issues_path(project)
-    redirect_to(index_path, notice: "Your CSV export has started. It will be emailed to #{current_user.notification_email} when complete.")
+    message = _('Your CSV export has started. It will be emailed to %{email} when complete.') % { email: current_user.notification_email }
+    redirect_to(index_path, notice: message)
   end
 
   def import_csv

app/views/notify/issues_csv_email.html.haml

--# haml-lint:disable NoPlainNodes
 %p{ style: 'font-size:18px; text-align:center;  line-height:30px;' }
-  Your CSV export of #{ pluralize(@written_count, 'issue') } from project
-  %a{ href: project_url(@project), style: "color:#3777b0; text-decoration:none; display:block;" }
-    = @project.full_name
-  has been added to this email as an attachment.
+  - project_link = link_to(@project.full_name, project_url(@project), style: "color:#3777b0; text-decoration:none; display:block;")
+  = _('Your CSV export of %{issues_count} from project %{project_link} has been added to this email as an attachment.').html_safe % { issues_count: pluralize(@written_count, 'issue'), project_link: project_link }
   - if @truncated
     %p
-      This attachment has been truncated to avoid exceeding a maximum allowed attachment size of 15MB. #{ @written_count } of #{ @issues_count } issues have been included. Consider re-exporting with a narrower selection of issues.
+      = _('This attachment has been truncated to avoid exceeding the maximum allowed attachment size of 15MB. %{written_count} of %{issues_count} issues have been included. Consider re-exporting with a narrower selection of issues.') % { written_count: @written_count, issues_count: @issues_count }

app/views/notify/issues_csv_email.text.erb

-Your CSV export of <%= pluralize(@written_count, 'issue') %> from project <%= @project.full_name %> (<%= project_url(@project) %>) has been added to this email as an attachment.
+<%= _('Your CSV export of %{written_count} from project %{project_name} (%{project_url}) has been added to this email as an attachment.') %  { written_count: pluralize(@written_count, 'issue'), project_name: @project.full_name, project_url: project_url(@project) } %>
 
 <% if @truncated %>
-This attachment has been truncated to avoid exceeding a maximum allowed attachment size of 15MB. <%= @written_count %> of <%= @issues_count %> issues have been included. Consider re-exporting with a narrower selection of issues.
+  <%= _('This attachment has been truncated to avoid exceeding the maximum allowed attachment size of 15MB. %{written_count} of %{issues_count} issues have been included. Consider re-exporting with a narrower selection of issues.') % { written_count: @written_count, issues_count: @issues_count} %>
 <% end %>

app/views/projects/issues/export_csv/_modal.html.haml

--# haml-lint:disable NoPlainNodes
 - if current_user
   .issues-export-modal.modal
     .modal-dialog

locale/gitlab.pot

@@ -20975,6 +20975,9 @@ msgstr ""
 msgid "This application will be able to:"
 msgstr ""
 
+msgid "This attachment has been truncated to avoid exceeding the maximum allowed attachment size of 15MB. %{written_count} of %{issues_count} issues have been included. Consider re-exporting with a narrower selection of issues."
+msgstr ""
+
 msgid "This block is self-referential"
 msgstr ""
 
@@ -24132,6 +24135,15 @@ msgstr ""
 msgid "Your %{strong}%{plan_name}%{strong_close} subscription will expire on %{strong}%{expires_on}%{strong_close}. After that, you will not to be able to create issues or merge requests as well as many other features."
 msgstr ""
 
+msgid "Your CSV export has started. It will be emailed to %{email} when complete."
+msgstr ""
+
+msgid "Your CSV export of %{issues_count} from project %{project_link} has been added to this email as an attachment."
+msgstr ""
+
+msgid "Your CSV export of %{written_count} from project %{project_name} (%{project_url}) has been added to this email as an attachment."
+msgstr ""
+
 msgid "Your Commit Email will be used for web based operations, such as edits and merges."
 msgstr ""