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, 4 insertions, 1 deletions

diff --git a/localedata/locales/dv_MV b/localedata/locales/dv_MV
index ab78fa5ce3..de0399f4c4 100644
--- a/localedata/locales/dv_MV
+++ b/localedata/locales/dv_MV
@@ -127,7 +127,10 @@ mon	"<U0796><U07AC><U0782><U07AA><U0787><U07A6><U0783><U07A9>";/
 	"<U0791><U07A8><U0790><U07AC><U0782><U07B0><U0784><U07A6><U0783>"
 
 % Date Time Format
-d_t_fmt "%Z %H:%M:%S %Y %b %d %a"
+d_t_fmt "%H:%M:%S %Y %b %d %a"
+
+% Date Time Format for date(1)
+date_fmt "%Z %H:%M:%S %Y %b %d %a"
 
 % date Format. I have put this in reverse order to try to get the date
 % in R->L order