Possibility to provide month names

[mszczotarz-dev]

Translated months to polish are not grammatically correct if there is no day column before (like it's in original picker). It would be cool to provide prop with mappings or something

[gusparis]

@dexterowy wow, wasn't aware of that! let me check about built-in translations before allowing a custom list, because it can make the component to be used in a different way as it was intended.