Support instance-wide OAuth2 applications (#21335)

Support OAuth2 applications created by admins on the admin panel, they
aren't owned by anybody.

Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: Lauris BH <lauris@nix.lv>

templates/admin/applications/list.tmpl

@@ -0,0 +1,14 @@
+{{template "base/head" .}}
+<div class="page-content admin config">
+	{{template "admin/navbar" .}}
+	<div class="ui container">
+		<div class="twelve wide column content">
+			{{template "base/alert" .}}
+			<h4 class="ui top attached header">
+					{{.locale.Tr "settings.applications"}}
+			</h4>
+			{{template "user/settings/applications_oauth2_list" .}}
+		</div>
+	</div>
+</div>
+{{template "base/footer" .}}

templates/admin/applications/oauth2_edit.tmpl

@@ -0,0 +1,7 @@
+{{template "base/head" .}}
+<div class="page-content admin config">
+	{{template "admin/navbar" .}}
+
+	{{template "user/settings/applications_oauth2_edit_form" .}}
+</div>
+{{template "base/footer" .}}

templates/admin/navbar.tmpl

@@ -26,6 +26,11 @@
 		<a class="{{if .PageIsAdminEmails}}active{{end}} item" href="{{AppSubUrl}}/admin/emails">
 			{{.locale.Tr "admin.emails"}}
 		</a>
+		{{if .EnableOAuth2}}
+			<a class="{{if .PageIsAdminApplications}}active{{end}} item" href="{{AppSubUrl}}/admin/applications">
+				{{.locale.Tr "settings.applications"}}
+			</a>
+		{{end}}
 		<a class="{{if .PageIsAdminConfig}}active{{end}} item" href="{{AppSubUrl}}/admin/config">
 			{{.locale.Tr "admin.config"}}
 		</a>

templates/user/auth/grant.tmpl

@@ -9,7 +9,7 @@
 				{{template "base/alert" .}}
 				<p>
 					<b>{{.locale.Tr "auth.authorize_application_description"}}</b><br/>
-					{{.locale.Tr "auth.authorize_application_created_by" .ApplicationUserLinkHTML | Str2html}}
+					{{.locale.Tr "auth.authorize_application_created_by" .ApplicationCreatorLinkHTML | Str2html}}
 				</p>
 			</div>
 			<div class="ui attached segment">