[Bug localedata/28643] it_IT: Days and Months do not have an uppercase letter

["maiku.fabian at gmail dot com" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=28643

--- Comment #1 from Mike FABIAN <maiku.fabian at gmail dot com> ---
They are not capitalized in CLDR either:

https://github.com/unicode-org/cldr/blob/main/common/main/it.xml#L1848
        <dayWidth type="wide">
                <day type="sun">domenica</day>
                <day type="mon">lunedì</day>
                <day type="tue">martedì</day>
                <day type="wed">mercoledì</day>
                <day type="thu">giovedì</day>
                <day type="fri">venerdì</day>
                <day type="sat">sabato</day>
        </dayWidth>

As far as I know, the capitalization of these words in Italian depends on
whether they appear at the beginning of a sentence or not.

    Gennaio è il primo mese dell'anno.
    Oggi è lunedì.
    L'italiano è una lingua bellissima.

So if they are usually not capitalized but only at the beginning of sentences,
then maybe the application using this data should
do the capitalization?

For example, maybe `cal` should capitalize here because these names appear "at
the beginning"?:

$ LC_ALL=it_IT.UTF-8 cal 
    novembre 2023   
lu ma me gi ve sa do
       1  2  3  4  5
 6  7  8  9 10 11 12
13 14 15 16 17 18 19
20 21 22 23 24 25 26
27 28 29 30

On the other hand, maybe almost all uses of this data in glibc are not within a
sentence, so maybe capitalizing always is OK?


> This bug is not present in other locales, as far as I know.

Currently many locales don’t have these capitalized:

glibc/localedata/locales (master $)
$ grep day  fr_FR es_ES
fr_FR:abday   "dim.";"lun.";"mar.";"mer.";"jeu.";"ven.";"sam."
fr_FR:day     "dimanche";/
fr_FR:first_weekday 2
es_ES:abday   "dom";"lun";/
es_ES:day     "domingo";/
es_ES:first_weekday   2

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