feat(rish): translations for widgets

[aymeric-giraudet]

FX-1708

Summary

• Make components in widgets accept an optional translations prop and forward it to the UI
• All components using ShowMoreButton can translate this button too
• Added translations to RefinementList for its internal searchbox and for 'no results'

Result

Added tests to each widget to check if the translation is taken into account, used mostly getBy* rather than snapshots to create less noise in tests

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[aymeric-giraudet]

Thanks @Haroenv ! It matches RFC except for showMore which I made into two labels rather than a function, there's a little discussion further up :D