Fix key signature error page (go-gitea#22229)

- Backport of go-gitea#22229
  - When the GPG key contains an error, such as an invalid signature or an email address that does not match the user.A page will be shown that says you must provide a signature for the token.
  - This page had two errors: one had the wrong translation key and the other tried to use an undefined variable [`.PaddedKeyID`](https://github.com/go-gitea/gitea/blob/e81ccc406bf723a5a58d685e7782f281736affd4/models/asymkey/gpg_key.go#L65-L72), which is a function implemented on the `GPGKey` struct, given that we don't have that, we use [`KeyID`](https://github.com/go-gitea/gitea/blob/e81ccc406bf723a5a58d685e7782f281736affd4/routers/web/user/setting/keys.go#L102) which is [the fingerprint of the publickey](https://pkg.go.dev/golang.org/x/crypto/openpgp/packet#PublicKey.KeyIdString) and is a valid way for opengpg to refer to a key.

Author: Gusted

Diff for: templates/user/settings/keys_gpg.tmpl

@@ -18,11 +18,11 @@
 					<p>{{.i18n.Tr "settings.gpg_token_required"}}</p>
 				</div>
 				<div class="field">
-					<label for="token">{{.i18n.Tr "setting.gpg_token"}}
+					<label for="token">{{.i18n.Tr "settings.gpg_token"}}
 					<input readonly="" value="{{.TokenToSign}}">
 					<div class="help">
 						<p>{{.i18n.Tr "settings.gpg_token_help"}}</p>
-						<p><code>{{$.i18n.Tr "settings.gpg_token_code" .TokenToSign .PaddedKeyID}}</code></p>
+						<p><code>{{$.i18n.Tr "settings.gpg_token_code" .TokenToSign .KeyID}}</code></p>
 					</div>
 				</div>
 				<div class="field">