btedit needs locale support

[memmerto]

From btedit.c: /* TODO: needs locale & gettext initialization */

Since this is a standalone program, and writes the requested key to a file which is edited with your choice of editor, how much locale support is needed in this program directly?

Need to look at the LL main program to see how it deals with editor locale vs GEDCOM locale.
Two possible options (off the top of my head):

• nothing is required. We assume that the editor is executed with the proper locale setting (eg, environment)
• conversion between editor / GEDCOM locale is required. For example, editor could be in C.UTF-8 whereas the btree (GEDCOM) could be in some other locale.