docs: feature/roles: update outdates site config docs

docs/features/roles.rst

@@ -11,13 +11,17 @@ For this the section ``roles`` in ``site.conf`` is needed::
   roles = {
     default = 'node',
     list = {
-      node = 'Normal Node',
-      test = 'Test Node',
-      backbone = 'Backbone Node',
-      service = 'Service Node',
+      'node',
+      'test',
+      'backbone',
+      'service',
     },
   },
 
+The strings to display in the LuCI interface are configured per language in the
+``i18n/en.po``, ``i18n/de.po``, etc. files of the site repository using message IDs like
+``gluon-luci-node-role:role:node`` and ``gluon-luci-node-role:role:backbone``.
+
 The value of ``default`` is the role every node will initially own. This value should be part of ``list`` as well.
 If you want node owners to change the defined roles via config-mode you can add the package
 ``gluon-luci-node-role`` to your ``site.mk``. Then, you can select one of the defined roles from a dropdown list

docs/user/site.rst

@@ -286,7 +286,7 @@ roles \: optional
     part of ``list``. If you want node owners to change the role via config mode add
     the package ``gluon-luci-node-role`` to ``site.mk``.
 
-    The strings to display in the LuCI interface can be configured per language in the
+    The strings to display in the LuCI interface are configured per language in the
     ``i18n/en.po``, ``i18n/de.po``, etc. files of the site repository using message IDs like
     ``gluon-luci-node-role:role:node`` and ``gluon-luci-node-role:role:backbone``.
     ::