This command is used to modify the description(s) of catalog groups. A list
of nouns and action expressions are passed to this command to act upon.
The description is locale dependent data. Multiple descriptions in diferent languages can be updated in a single
request for a given catalog group. Language ID must be specified for for each description noun part. If the language
ID is supported by store in current context, the description data will be updated in database if it already exists.
If description does not exists for a given language ID, it will be created. If language ID specified is not supported
by the store in current context, a validaion error will be thrown.
This command implementation does not support add and delete actions.