Fix timestamp on featured tag (#11477)

It resolves #11338

app/views/accounts/show.html.haml

@@ -73,7 +73,7 @@
               - if featured_tag.last_status_at.nil?
                 = t('accounts.nothing_here')
               - else
-                %time{ datetime: featured_tag.last_status_at.iso8601, title: l(featured_tag.last_status_at) }= l featured_tag.last_status_at
+                %time.formatted{ datetime: featured_tag.last_status_at.iso8601, title: l(featured_tag.last_status_at) }= l featured_tag.last_status_at
           .trends__item__current= number_to_human featured_tag.statuses_count, strip_insignificant_zeros: true
 
     = render 'application/sidebar'