feat: Introduce a number locale override

[DanielWilliamClarke]

Description

We need to be able to format numbers on the AT point of sale like we do in DE

This is handed by Intl.NumberFormat(locale, value) in Phrasebook

We pass de-AT as the locale on the AT pos, where we expect numbers to be formatted like 12.345 but instead we see 12 345. This is because Intl.NumberFormat() doesn't really recognise de-AT and just falls back to a default

To handle this, and render numbers in AT like they are shown in DE, I propose here to pass through the t() method an override locale, the reasons for this are

• Passing a preformatted stringified count value will shut of the inbuilt pluralisation functionality, and would require a fair amount of logic to parse these values back to numbers to regain it, considering that DE formatted numbers like decimals to the outside world this is a bit tricky 1.234 -> 1 etc
• We already have a secondary locale in place in sunrise that can be configured via Sanity so passing this value on a need to use basis is rather simple by the consumer

Expected usage in consumers

const { t } = useTranslation();
const {
  site: { secondaryLocale },
} = useAppContext();

... 
t('xHolidaysFound', { count, overrideLocale: secondaryLocale })

For these reasons the proposed changes in this PR yield the simplest way forward

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Size Change: +26 B (+2.34%)

Total Size: 1.14 kB

Filename	Size	Change
./lib/index.js	1.14 kB	+26 B (+2.34%)

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