Fix some untranslatable commands in Web UI API Browser

There are some missing translatable docstrings of commands and modules.

Fixes: https://pagure.io/freeipa/issue/7592
Reviewed-By: Tibor Dudlak <tdudlak@redhat.com>

ipaserver/plugins/dns.py

@@ -3550,6 +3550,7 @@ for param in _dns_records:
 
 @register()
 class dnsrecord_split_parts(Command):
+    __doc__ = _('Split DNS record to parts')
     NO_CLI = True
 
     takes_args = (