auth-tokens: fix placeholder text

rhodecode/templates/admin/my_account/my_account_auth_tokens.mako

@@ -116,7 +116,7 b' var preloadData = {'
     dropdownCssClass: "drop-menu-dropdown",
     dropdownAutoWidth: true,
     data: preloadData,
-    placeholder: ${_('Select or enter expiration date')},
+    placeholder: "${_('Select or enter expiration date')}",
     query: function(query) {
         feedLifetimeOptions(query, preloadData);
     }

rhodecode/templates/admin/users/user_edit_auth_tokens.mako

@@ -112,7 +112,7 b' var preloadData = {'
     dropdownCssClass: "drop-menu-dropdown",
     dropdownAutoWidth: true,
     data: preloadData,
-    placeholder: ${_('Select or enter expiration date')},
+    placeholder: "${_('Select or enter expiration date')}",
     query: function(query) {
         feedLifetimeOptions(query, preloadData);
     }