Localization support
From cppreference.com
                    
                                        
                    < c
                    
                                                            
                    |   Defined in header  
<locale.h>  | 
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|    gets and sets the current C locale  (function)  | 
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|    queries numeric and monetary formatting details of the current locale  (function)  | 
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|    formatting details, returned by localeconv   (class)  | 
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 Locale categories | 
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|    locale categories for setlocale  (macro constant)  | 
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