Add copy to KYCDialog

[danbr]

Description

This PR adds copy to the loading spinner in KYCDialog.

New stuff ✨

• New loading message in KYCDialog.

How to test

GetWhitelisted.tsx
*replace with true

const openKYCDialog = useCallback(() => {
 return true
 ? // data?.processedMetaColony?.colonyAddress === colonyAddress
 openSynapsEmailDialog({ colonyAddress, onClose: openSynapsDialog })
 : openCompleteKYCDialog();
 }

SynapsKYCDialog.tsx
*remove isLoading condition

{/* {isLoading && ( */}
 <SpinnerLoader
 loadingText={MSG.loadingText.defaultMesage}
 appearance={{ size: 'large' }}
 />
 {/* )} */}

Steps:
*Install whitelist ext with KYC (do not whitelist an address)
*Install coinMachine
*Go to buy tokens page
*Click get whitelisted button
*Click next button

Resolves #2903

[arrenv]

Looks good, just one point regarding my comment on CSS targeting.

[chinins]

All good.