Tarzan won't let me past

On THE BACKLOT, TARZAN, Tarzan blocks the way into the jungle. Seymour says who he is, and Tarzan doesn't understand a word.
Nudge 1Where to look
It's a language problem. Somebody in the studio building works with words all day.
Nudge 2A stronger push
To translate anything you need a dictionary, and a person who knows how to say things properly.
Nudge 3Almost there
The receptionist is the one to ask, but she's grumpy: see Pippa at reception is grumpy.
Show the solutionThe whole answer, with a video
Once Pippa has her dictionary back she teaches Seymour the Mgambese for "I'm Seymour and I'm everyone's friend": UMGAWA!. Walk up to Tarzan after that and they swap UMGAWAs; he says "THANKYOU" and lets Seymour into the jungle for good.
Why it works
Tarzan's script checks the flag Pippa sets when she explains the word; with it he steps aside and sets his own flag.