doc: mention the texinfo documentation in --help

* src/system.h: Rename emit_bug_reporting_address() to
emit_ancillary_info() and update it to not print the translation
project address in en_* locales, and _do_ print it in the 'C'
(and other) locales so that it's included in the default man page.
Also mention how to invoke the texinfo documentation for each command.
Also move the "hard-locale.h" include to the 8 files that now use it.
* man/help2man: Strip the newly added texinfo reference from the
--help output as a more verbose version is already added by help2man.
Suggestion from C de-Avillez

1 files changed, 1 insertions, 1 deletions

diff --git a/src/tr.c b/src/tr.c
index 0b985f801..c5f18f983 100644
--- a/src/tr.c
+++ b/src/tr.c
@@ -346,7 +346,7 @@ only be used in pairs to specify case conversion.  -s uses SET1 if not\n\
 translating nor deleting; else squeezing uses SET2 and occurs after\n\
 translation or deletion.\n\
 "), stdout);
-      emit_bug_reporting_address ();
+      emit_ancillary_info ();
     }
   exit (status);
 }