[Bug localedata/23140] More languages need two forms of month names

["digitalfreak at lingonborough dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=23140

--- Comment #34 from Rafal Luzynski <digitalfreak at lingonborough dot com> ---
I can't even read Armenian script but I'm trying to figure out what's going on
here.  Armenian alphabet seems to have upper and lowercase, same as Latin,
Cyrillic, and Greek.  Glibc currently seems to provide the month names starting
with uppercase.  It is easy to convert between uppercase and lowercase:
uppercase code points are 0x30 less than lowercase.  For example, current
March:

"<U0544><U0561><U0580><U057F><U056B>"

Decoded:

"Մարտի"

Should be transliterated as:

"Marti"

My patch which is an import from CLDR converts it to:

alt_mon: "<U0574><U0561><U0580><U057F>"        => "մարտ"  => "mart"
mon:     "<U0574><U0561><U0580><U057F><U056B>" => "մարտի" => "marti"

So it looks like the locale data currently contain the month names in a
genitive case (or whatever is correct to use in a full date) starting with
uppercase while CLDR uses lowercase exclusively.  Please note that we had a
similar case in Lithuanian language already.

But Armenian language seems to use "month day" order, same as English, so the
month name may tend to appear at the beginning of a sentence and it may be
reasonable to start it with an uppercase even if there is no rule in a language
which says that the month names should be always titlecased.  If mon array is
titlecased then alt_mon should be as well (CLDR suggest that alt_mon may be
titlecased and mon lowercased but not the reverse) so maybe we should use a
titlecase for alt_mon as well.

Converting this to a titlecase the decoded patch for hy_AM would look like
this:

diff --git a/localedata/locales/hy_AM b/localedata/locales/hy_AM
index 805c327..30033a9 100644
--- a/localedata/locales/hy_AM
+++ b/localedata/locales/hy_AM
@@ -130,6 +130,18 @@ abmon       "Հնվ";/
             "Հոկ";/
             "Նմբ";/
             "Դեկ"
+alt_mon     "Հունվար";/
+            "Փետրվար";/
+            "Մարտ";/
+            "Ապրիլ";/
+            "Մայիս";/
+            "Հունիս";/
+            "Հուլիս";/
+            "Օգոստոս";/
+            "Սեպտեմբեր";/
+            "Հոկտեմբեր";/
+            "Նոյեմբեր";/
+            "Դեկտեմբեր"
 mon         "Հունվարի";/
             "Փետրվարի";/
             "Մարտի";/

I'm still looking for the people to confirm this.

Links:

http://st.unicode.org/cldr-apps/v#/hy/Gregorian/
https://www.fileformat.info/info/unicode/block/armenian/list.htm
https://en.wikipedia.org/wiki/Armenian_alphabet
https://hy.wikipedia.org/wiki/%D5%84%D5%A1%D6%80%D5%BF%D5%AB_1 (this is an
example of an Armenian date)

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