Change `valid_until` translation to `valid_until_date` and include placeholder for the date (#24563)

- Similar to #24550
- Similar to #24562 

The correct thing to do is to translate the entire phrase into a single
string. The previous translation assumed all languages have a space
between the "valid until" and the date (and that "valid until" comes
before the date).

Signed-off-by: Yarden Shoham <git@yardenshoham.com>

options/locale/locale_en-US.ini

@@ -755,7 +755,7 @@ ssh_key_deletion_success = The SSH key has been removed.
 gpg_key_deletion_success = The GPG key has been removed.
 ssh_principal_deletion_success = The principal has been removed.
 add_on = Added on
-valid_until = Valid until
+valid_until_date = Valid until %s
 valid_forever = Valid forever
 last_used = Last used on
 no_activity = No recent activity

templates/user/settings/keys_gpg.tmpl

@@ -70,7 +70,7 @@
 					<div class="activity meta">
 						<i>{{$.locale.Tr "settings.add_on"}} <span>{{DateTime "short" .AddedUnix}}</span></i>
 						-
-						<i>{{if not .ExpiredUnix.IsZero}}{{$.locale.Tr "settings.valid_until"}} <span>{{DateTime "short" .ExpiredUnix}}</span>{{else}}{{$.locale.Tr "settings.valid_forever"}}{{end}}</i>
+						<i>{{if not .ExpiredUnix.IsZero}}{{$.locale.Tr "settings.valid_until_date" (DateTime "short" .ExpiredUnix) | Safe}}{{else}}{{$.locale.Tr "settings.valid_forever"}}{{end}}</i>
 					</div>
 				</div>
 			</div>