Adds i18n for empty state

ee/app/views/projects/issues/_service_desk_info_content.html.haml

@@ -4,7 +4,7 @@
 - callout_selector = is_empty_state ? 'empty-state' : 'non-empty-state media'
 - svg_path = !is_empty_state ? 'shared/empty_states/icons/service_desk_callout.svg' : 'shared/empty_states/icons/service_desk_empty_state.svg'
 - can_edit_project_settings = can?(current_user, :admin_project, @project)
-- title_text = "Use Service Desk to connect with your users (e.g. to offer customer support) through email right inside GitLab"
+- title_text = _("Use Service Desk to connect with your users (e.g. to offer customer support) through email right inside GitLab")
 
 %div{ class: "#{callout_selector}" }
   .svg-content
@@ -18,12 +18,12 @@
 
     - if service_desk_enabled
       %p
-        Have your users email
+        = _("Have your users email")
         %code= @project.service_desk_address
 
-    %span Those emails automatically become issues (with the comments becoming the email conversation) listed here.
-    = link_to 'Read more', help_page_path('user/project/service_desk')
+    %span= _("Those emails automatically become issues (with the comments becoming the email conversation) listed here.")
+    = link_to _('Read more'), help_page_path('user/project/service_desk')
 
     - if can_edit_project_settings && !service_desk_enabled
       %div{ class: is_empty_state ? "text-center" : "prepend-top-10" }
-        = link_to "Turn on Service Desk", edit_project_path(@project), class: 'btn btn-success'
+        = link_to _("Turn on Service Desk"), edit_project_path(@project), class: 'btn btn-success'