EE port of "list ssh-ed25519 example"

See merge request gitlab-org/gitlab-ce!28090

app/views/profiles/keys/_form.html.haml

@@ -4,8 +4,8 @@
 
     .form-group
       = f.label :key, s_('Profiles|Key'), class: 'label-bold'
-      %p= _("Paste your public SSH key, which is usually contained in the file '~/.ssh/id_rsa.pub' and begins with 'ssh-rsa'. Don't use your private SSH key.")
-      = f.text_area :key, class: "form-control js-add-ssh-key-validation-input qa-key-public-key-field", rows: 8, required: true, placeholder: s_('Profiles|Typically starts with "ssh-rsa …"')
+      %p= _("Paste your public SSH key, which is usually contained in the file '~/.ssh/id_ed25519.pub' or '~/.ssh/id_rsa.pub' and begins with 'ssh-ed25519' or 'ssh-rsa'. Don't use your private SSH key.")
+      = f.text_area :key, class: "form-control js-add-ssh-key-validation-input qa-key-public-key-field", rows: 8, required: true, placeholder: s_('Profiles|Typically starts with "ssh-ed25519 …" or "ssh-rsa …"')
     .form-group
       = f.label :title, _('Title'), class: 'label-bold'
       = f.text_field :title, class: "form-control input-lg qa-key-title-field", required: true, placeholder: s_('Profiles|e.g. My MacBook key')

locale/gitlab.pot

@@ -9260,7 +9260,7 @@ msgstr ""
 msgid "Paste issue link"
 msgstr ""
 
-msgid "Paste your public SSH key, which is usually contained in the file '~/.ssh/id_rsa.pub' and begins with 'ssh-rsa'. Don't use your private SSH key."
+msgid "Paste your public SSH key, which is usually contained in the file '~/.ssh/id_ed25519.pub' or '~/.ssh/id_rsa.pub' and begins with 'ssh-ed25519' or 'ssh-rsa'. Don't use your private SSH key."
 msgstr ""
 
 msgid "Path"
@@ -10013,7 +10013,7 @@ msgstr ""
 msgid "Profiles|Type your %{confirmationValue} to confirm:"
 msgstr ""
 
-msgid "Profiles|Typically starts with \"ssh-rsa …\""
+msgid "Profiles|Typically starts with \"ssh-ed25519 …\" or \"ssh-rsa …\""
 msgstr ""
 
 msgid "Profiles|Update profile settings"