Add `date_range` view helper (#32187)

app/helpers/admin/dashboard_helper.rb

@@ -18,6 +18,11 @@ module Admin::DashboardHelper
     end
   end
 
+  def date_range(range)
+    [l(range.first), l(range.last)]
+      .join(' - ')
+  end
+
   def relevant_account_timestamp(account)
     timestamp, exact = if account.user_current_sign_in_at && account.user_current_sign_in_at < 24.hours.ago
                          [account.user_current_sign_in_at, true]

app/views/admin/dashboard/index.html.haml

@@ -2,9 +2,7 @@
   = t('admin.dashboard.title')
 
 - content_for :heading_actions do
-  = l(@time_period.first)
-  = ' - '
-  = l(@time_period.last)
+  = date_range(@time_period)
 
 - unless @system_checks.empty?
   .flash-message-stack

app/views/admin/instances/show.html.haml

@@ -3,9 +3,7 @@
 
 - if current_user.can?(:view_dashboard)
   - content_for :heading_actions do
-    = l(@time_period.first)
-    = ' - '
-    = l(@time_period.last)
+    = date_range(@time_period)
 
   - if @instance.persisted?
     = render 'dashboard', instance_domain: @instance.domain, period_end_at: @time_period.last, period_start_at: @time_period.first

app/views/admin/tags/show.html.haml

@@ -4,9 +4,7 @@
 - content_for :heading_actions do
   - if current_user.can?(:view_dashboard)
     .time-period
-      = l(@time_period.first)
-      = ' - '
-      = l(@time_period.last)
+      = date_range(@time_period)
 
   = link_to t('admin.tags.open'), tag_url(@tag), class: 'button', target: '_blank', rel: 'noopener noreferrer'