Update register application URL for GitLab (#29959)

Fix #26593
The old URL was updated 7 years ago. Maybe no need to hold it any more.

![image](https://github.com/go-gitea/gitea/assets/18380374/95a0b364-832b-4f10-800e-21845d64df1a)

Author: yp05327

options/locale/locale_en-US.ini

@@ -3093,7 +3093,7 @@ auths.tip.nextcloud = Register a new OAuth consumer on your instance using the f
 auths.tip.dropbox = Create a new application at https://www.dropbox.com/developers/apps
 auths.tip.facebook = Register a new application at https://developers.facebook.com/apps and add the product "Facebook Login"
 auths.tip.github = Register a new OAuth application on https://github.com/settings/applications/new
-auths.tip.gitlab = Register a new application on https://gitlab.com/profile/applications
+auths.tip.gitlab_new = Register a new application on https://gitlab.com/-/profile/applications
 auths.tip.google_plus = Obtain OAuth2 client credentials from the Google API console at https://console.developers.google.com/
 auths.tip.openid_connect = Use the OpenID Connect Discovery URL (<server>/.well-known/openid-configuration) to specify the endpoints
 auths.tip.twitter = Go to https://dev.twitter.com/apps, create an application and ensure that the “Allow this application to be used to Sign in with Twitter” option is enabled

templates/admin/auth/new.tmpl

@@ -99,7 +99,7 @@
 				<li>GitHub</li>
 				<span>{{ctx.Locale.Tr "admin.auths.tip.github"}}</span>
 				<li>GitLab</li>
-				<span>{{ctx.Locale.Tr "admin.auths.tip.gitlab"}}</span>
+				<span>{{ctx.Locale.Tr "admin.auths.tip.gitlab_new"}}</span>
 				<li>Google</li>
 				<span>{{ctx.Locale.Tr "admin.auths.tip.google_plus"}}</span>
 				<li>OpenID Connect</li>