Rework SSH key management UI to add GPG (#1293)

* Rework SSH key management UI to add GPG

* Add more detail to gpg key display

* Update CHANGELOG.md

* Implement deletion UI

* Implement adding gpg UI

* Various fixes

- Fix duplicate entry in locale
- Re-generate hash before verification since they are consumed

* Add missing translation

* Split template

* Catch not found/verified email error

templates/user/settings/keys.tmpl

@@ -0,0 +1,12 @@
+{{template "base/head" .}}
+<div class="user settings sshkeys">
+	{{template "user/settings/navbar" .}}
+	<div class="ui container">
+		{{template "base/alert" .}}
+		{{template "user/settings/keys_ssh" .}}
+		<br>
+		{{template "user/settings/keys_gpg" .}}
+	</div>
+</div>
+
+{{template "base/footer" .}}