Public bug reported:

[Background]
Many packages are affected by the requirement to support the new era "Reiwa" 
(令和)

This is the meta bug to track packages that need fixes; which packages
have already been SRUd to previous releases, how to prioritize the work
needed, and general test cases for verifying that things are working as
expected.

[Impact]
Users who run Ubuntu in Japanese.

[Test cases]

== Date output ==

1) Set date to 2019/05/01
2) Output date; verify that the year it is displayed as "令和元年"
3) Set date to 2019/04/30
4) Output date; verify that the year is diplayed as "平成31年"

=== Displaying formatted year for Japanese era with glibc ===

Run:
LC_ALL=ja_JP.utf8 date +%EY -d 20190430 # previous era (should still work as 
before SRUs)
or
LC_ALL=ja_JP.utf8 date +%EY -d 20190501 # new era (should now correctly display 
the new era)


[Regression potential]
This is a potentially large change as it impacts font display, character sets 
as well as date conversions. As such, extreme care should be taken to ensure 
that regressions are avoided, such that dates previous to May 1, 2019 continue 
to display as before, and dates onward are displayed with the new era symbols. 
The included test cases account for verifying the continued behavior or 
previous dates.

** Affects: glibc (Ubuntu)
     Importance: Undecided
         Status: Fix Released

** Affects: glibc (Ubuntu Bionic)
     Importance: Undecided
         Status: New

** Affects: glibc (Ubuntu Disco)
     Importance: Undecided
         Status: New

** Changed in: glibc (Ubuntu)
       Status: New => Fix Released

** Bug watch added: Sourceware.org Bugzilla #22964
   https://sourceware.org/bugzilla/show_bug.cgi?id=22964

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https://bugs.launchpad.net/bugs/1838327

Title:
  Support Japanese new era "令和 (Reiwa)"

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