Rename labels/words in fusion screens

Hi,

I Tried to change word in fusion screens like changing "Plan" word to be "Vacation"

but while change it using page composer tool in sandbox it seems the original word is Retrieved from other source

#{hcmGblAbsencesTopGenBundle['Header.PlanBalances.PlanEnrollmentsandBalances']}

Is there away to change the original word from original source instead of just writing the new value .

Thanks.