doc/help localization changes

- by default, do not build any other locale than C for now
- do not try to build the guides.  These require functioning
  dtinfo/docbook
- add a Linux.lcx locale translation db.  Not used yet.
- fix some overflows in dtdocbook/instant

cde/doc/fr_FR.ISO8859-1/Imakefile

@@ -2,7 +2,12 @@ XCOMM $XConsortium: Imakefile /main/3 1996/06/19 16:43:05 drk $
 #define IHaveSubdirs
 #define PassCDebugFlags
 
+#if defined(LinuxArchitecture)
+XCOMM we cannot build guides on linux yet
+SUBDIRS = help 
+#else
 SUBDIRS = help guides
+#endif
 
 MakeSubdirs($(SUBDIRS))