Add title placeholder for new issues

app/views/shared/issuable/form/_title.html.haml

@@ -6,7 +6,7 @@
 
 %div{ class: div_class }
   = form.text_field :title, required: true, maxlength: 255, autofocus: true,
-      autocomplete: 'off', class: 'form-control pad qa-issuable-form-title'
+      autocomplete: 'off', class: 'form-control pad qa-issuable-form-title', placeholder: _('Title')
 
   - if issuable.respond_to?(:work_in_progress?)
     %p.form-text.text-muted

changelogs/unreleased/add-title-placeholder-for-new-issues.yml

+---
+title: Add title placeholder for new issues
+merge_request: 20271
+author: George Tsiolis
+type: changed