Add last activity label to RFCs

app/views/request_for_comments/index.html.slim

@@ -20,6 +20,7 @@ h1 = RequestForComment.model_name.human(count: 2)
           i class="fa fa-comment" aria-hidden="true" title = t('request_for_comments.comments') align="center"
         th = t('activerecord.attributes.request_for_comments.username')
         th = t('activerecord.attributes.request_for_comments.requested_at')
+        th = t('activerecord.attributes.request_for_comments.last_update')
     tbody
       - @request_for_comments.each do |request_for_comment|
         tr data-id=request_for_comment.id
@@ -36,5 +37,7 @@ h1 = RequestForComment.model_name.human(count: 2)
           td = request_for_comment.comments_count
           td = request_for_comment.user.displayname
           td = t('shared.time.before', time: distance_of_time_in_words_to_now(request_for_comment.created_at))
+          - last_comment = request_for_comment.comments.order('created_at DESC').first
+          td = t('shared.time.before', time: distance_of_time_in_words_to_now(last_comment.nil? ? request_for_comment.updated_at : last_comment.updated_at))
 
 = render('shared/pagination', collection: @request_for_comments)

config/locales/de.yml

@@ -94,6 +94,7 @@ de:
         requested_at: Angefragezeitpunkt
         question: "Frage"
         close: "Fenster schließen"
+        last_update: "Letzte Aktivität"
       submission:
         cause: Anlass
         code: Code

config/locales/en.yml

@@ -115,6 +115,7 @@ en:
         requested_at: Request Date
         question: "Question"
         close: Close window
+        last_update: "Last Update"
       submission:
         cause: Cause
         code: Code