sheenachhabra a358ccb046 Fix double initialisation of createIsoLanguageReplacementMap
In the absence of any lock `createIsoLanguageReplacementMap`
method was getting called twice due to race condition.
Used Suppliers.memoize() which is by default thread safe.

PiperOrigin-RevId: 524007754
2023-04-17 17:01:41 +01:00
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