The locale may be changed via the Configure menu. A list of available locales is popped up, from which one may be selected. Note that this changes the locale only for Redet and the programs that it executes. The locale of the shell from which Redet was executed, if any, is not affected.
When the locale is changed, the feature tests are re-run if necessary and the palette rebuilt since a change of locale may affect such aspects of the behaviour of the program as the availability of Unicode and the meaning of character classes.