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 3.1.2.5 Locale-Specific Translation
 ...................................
 
 A double-quoted string preceded by a dollar sign (`$') will cause the
 string to be translated according to the current locale.  If the
 current locale is `C' or `POSIX', the dollar sign is ignored.  If the
 string is translated and replaced, the replacement is double-quoted.
 
    Some systems use the message catalog selected by the `LC_MESSAGES'
 shell variable.  Others create the name of the message catalog from the
 value of the `TEXTDOMAIN' shell variable, possibly adding a suffix of
 `.mo'.  If you use the `TEXTDOMAIN' variable, you may need to set the
 `TEXTDOMAINDIR' variable to the location of the message catalog files.
 Still others use both variables in this fashion:
 `TEXTDOMAINDIR'/`LC_MESSAGES'/LC_MESSAGES/`TEXTDOMAIN'.mo.
 

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