So what name will the language have?(should I change draconic for it or get rid of diplomacy and keep both plus another language on the skills? - if I understood the language skill correctly)

(if you don't mind my input it could be a variation of infernal or abyssal, depending the overlord alignment, using a bunch of borrowed expressions and words from the evil races original languages that makes his/her armies)

I'm fine with any choice. Though I fear a small party might mess with the encounters CR's.