Add missing documentation for LanguagePack API
Add missing documentation for LanguagePack API

Change-Id: I0a968a0fec04e234cec1fc951b2cdf91bf8b2ad2

gilbertpilz/solum,gilbertpilz/solum,gilbertpilz/solum,devdattakulkarni/test-solum,ed-/solum,devdattakulkarni/test-solum,openstack/solum,stackforge/solum,ed-/solum,ed-/solum,gilbertpilz/solum,openstack/solum,stackforge/solum,ed-/solum