[Translation] Fix caching of parent locales file in translator #37449
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The
parentLocales
property was probably meant as a cache for the content of theparents.json
file but instead the content is stored in a local variable and the property staysnull
. This means the file is read on each call tocomputeFallbackLocales
.This PR update the code to what was probably meant to be.
(Ref #28070)