correct ByAuthor translation in commit box

app/views/projects/commit/_commit_box.html.haml

@@ -6,7 +6,7 @@
     = clipboard_button(text: @commit.id, title: _("Copy commit SHA to clipboard"))
     %span.hidden-xs authored
     #{time_ago_with_tooltip(@commit.authored_date)}
-    %span= _('ByAuthor|by')
+    %span= s_('ByAuthor|by')
     = author_avatar(@commit, size: 24)
     %strong
       = commit_author_link(@commit, avatar: true, size: 24)