Multiple locales: Add date_fmt (bug 24054)

It is not specified what should be the content of d_t_fmt and date_fmt
but in the built-in C locale those fields have only one difference:
date_fmt contains "%Z" (the current time zone) while d_t_fmt does not.

For most of the locales this commit does the following operation:
copy d_t_fmt to date_fmt, and then remove "%Z" from d_t_fmt.
If "%Z" was originally missing from d_t_fmt add it to date_fmt.
It also corrects comments where necessary.

Exceptions:

* In bo_CN, dz_BT, and km_KH "%Z" has not been added to date_fmt because
  it was too difficult.  In these locales date_fmt has been set to the
  copy of d_t_fmt.
* In en_DK "%Z" has not been removed from d_t_fmt in order to preserve
  the conformance with the standard mentioned in the comment.

The command to identify and initially edit the locales that need the
update was:

    for i in `grep -lw d_t_fmt *`
    do
        if ! grep -qw date_fmt $i ; then
            awk '/d_t_fmt/ { print $0; gsub("d_t_fmt", "date_fmt"); } //{ print $0 }' < $i > $i.next
            mv $i.next $i
        fi
    done

and then each file was further edited manually.

1 files changed, 2 insertions, 1 deletions

diff --git a/localedata/locales/as_IN b/localedata/locales/as_IN
index b237ecc1f6..1e731c42cc 100644
--- a/localedata/locales/as_IN
+++ b/localedata/locales/as_IN
@@ -103,7 +103,8 @@ mon     "<U099C><U09BE><U09A8><U09C1><U09F1><U09BE><U09F0><U09C0>";/
         "<U09A1><U09BF><U099A><U09C7><U09AE><U09CD><U09AC><U09F0>"
 d_fmt    "%e-%m-%Y"
 t_fmt    "%I.%M.%S %p"
-d_t_fmt  "%e %B, %Y %I.%M.%S %p %Z"
+d_t_fmt  "%e %B, %Y %I.%M.%S %p"
+date_fmt "%e %B, %Y %I.%M.%S %p %Z"
 am_pm    "<U09AA><U09C2><U09F0><U09CD><U09AC><U09CD><U09AC><U09BE><U09B9><U09CD><U09A8>";"<U0985><U09AA><U09F0><U09BE><U09B9><U09CD><U09A8>"
 t_fmt_ampm  "%I.%M.%S %p"
 week 7;19971130;1