[system.error.syn,locale.facet] Replace 'automatic' by 'implicit' conversion

Author: jensmaurer

source/diagnostics.tex

@@ -827,7 +827,7 @@
 \pnum
 The \tcode{is_error_code_enum} and \tcode{is_error_condition_enum} templates may be
 specialized for program-defined types to indicate that such types are eligible
-for \tcode{class error_code} and \tcode{class error_condition} automatic
+for \tcode{class error_code} and \tcode{class error_condition} implicit
 conversions, respectively.
 
 \rSec2[syserr.errcat]{Class \tcode{error_category}}

source/locales.tex

@@ -453,7 +453,7 @@
 take such an argument and pass it along to
 their \tcode{facet} base class constructor.
 All one-argument constructors defined in this Clause are \term{explicit},
-preventing their participation in automatic conversions.
+preventing their participation in implicit conversions.
 
 \pnum
 For some standard facets a standard ``$\ldots$\tcode{_byname}'' class,