Calendar: FullCalendar locales limited, lang / locale mixup in fullcalendar, implement custom Fc Intl backend

[ongun-kanat]

I use English (Ireland) locale for my user in my Nextcloud. The display language is English US However, the new calendar app shows Sunday as the first day of the week which is wrong for English Ireland.

Steps to reproduce

1. Set locale English (Ireland) in user settings
2. Open calendar app

Expected behaviour

The first day of the week is Sunday

Actual behaviour

The first day of the week should be Monday

Calendar app

Calendar app version: 2.0.0

Client configuration

Browser: Firefox 72.0.1

Operating system: Linux

Server configuration

Operating system: openSUSE

Web server: Apache

Database: MariaDB

PHP version: 7.3.13

Nextcloud Version: 17.0.2

Updated from an older installed version or fresh install: Update

List of activated apps:

Enabled:
  - accessibility: 1.3.0
  - activity: 2.10.1
  - admin_audit: 1.7.0
  - apporder: 0.9.0
  - bookmarks: 2.3.4
  - bruteforcesettings: 1.4.0
  - calendar: 2.0.0
  - checksum: 0.4.3
  - cloud_federation_api: 1.0.0
  - comments: 1.7.0
  - contacts: 3.1.6
  - dav: 1.13.0
  - federatedfilesharing: 1.7.0
  - federation: 1.7.0
  - files: 1.12.0
  - files_external: 1.8.0
  - files_frommail: 0.3.0
  - files_markdown: 2.2.0
  - files_pdfviewer: 1.6.0
  - files_rightclick: 0.15.1
  - files_sharing: 1.9.0
  - files_trashbin: 1.7.0
  - files_versions: 1.10.0
  - files_videoplayer: 1.6.0
  - firstrunwizard: 2.6.0
  - gallery: 18.4.0
  - logreader: 2.2.0
  - lookup_server_connector: 1.5.0
  - mail: 1.0.0
  - metadata: 0.10.0
  - nextcloud_announcements: 1.6.0
  - notes: 3.1.1
  - notifications: 2.5.0
  - oauth2: 1.5.0
  - password_policy: 1.7.0
  - passwords: 2020.1.0
  - privacy: 1.1.0
  - provisioning_api: 1.7.0
  - recommendations: 0.5.0
  - serverinfo: 1.7.0
  - sharebymail: 1.7.0
  - socialsharing_email: 1.0.6
  - spreed: 7.0.2
  - support: 1.0.1
  - survey_client: 1.5.0
  - systemtags: 1.7.0
  - tasks: 0.11.3
  - text: 1.1.1
  - theming: 1.8.0
  - twofactor_backupcodes: 1.6.0
  - updatenotification: 1.7.0
  - viewer: 1.2.0
  - workflowengine: 1.7.0
Disabled:
  - encryption
  - user_ldap

Nextcloud configuration:

{
    "system": {
        "dbtype": "mysql",
        "version": "17.0.2.1",
        "dbport": "",
        "dbtableprefix": "oc_",
        "installed": true,
        "mail_smtpmode": "sendmail",
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpsecure": "tls",
        "maintenance": false,
        "theme": "",
        "loglevel": 2,
        "memcache.local": "\\OC\\Memcache\\APCu",
        "mysql.utf8mb4": true,
        "updater.release.channel": "stable"
    }
}

---

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[georgehrke]

Indeed it seems to be unable to resolve en_ie and falls back to english us.

[georgehrke]

It's actually loading the correct chunk:

http://nextcloud.local/apps/calendar/js/chunks/calendar.94.4bcded322b2bff7589d3.js

Will need some debugging.

[georgehrke]

The problem is that fullcalendar itself does not have a locale for ireland:
https://github.com/fullcalendar/fullcalendar/tree/master/packages/core/src/locales

We should try to build the locale ourselves based on the information we get from moment in that case.

[dalins]

I think my bug is related to it, if it is not the same.
In my case the full calendar starts with Monday, but the popup calendar starts at Sunday.

Language: English (US)
Locale: German (Germany)

[georgehrke]

@dalins No, it doesn't seem to be related. Can you please open a new issue (filling the entire issue template)

[jgonsior]

I thought this here is the same as #2175 ? Because if not, I would put the picture from @dalins into #2175 and reopen it?

[georgehrke]

@jgonsior You talked about "KW" and Ganztägig in the calendar grid, that is a duplicate of this issue.

What @dalins is talking about is not the calendar grid, but the date-picker inside the editor.

[jgonsior]

I'd say the question is, what is wrong and what is right. Are the German names for the weekdays correct (which I mentioned as well next to "KW" and "Ganztägig") because of the locale setting of the system, or are the English names in the date-picker correct because the language setting of Nextcloud was set to English. So are the displayed German names in the calendar grid correct, and the displayed English names in the date-picker wrong, or is it the other way around?
My intuition would actually be to respect the language setting of Nextcloud and use English names and not the locale setting of the user's system.

[georgehrke]

The locale should only influence the first day of the week and date formatting like DD.MM.YYYY, MM/DD/YYYY. (and also how to calculate the calendar week, because like for everything, the USA has its desperate need for their own standard ¯\_(ツ)_/¯)

Day names and month names should be in the user's preferred language.

Taking @dalins's example:
Language: English (US)
Locale: German (Germany)

Weekdays: Monday, Tuesday, Wednesday, ...
Month names: January, February, ...

Date format: 16.04.2020 (DD.MM.YYYY)
First day of week: Monday
Time format: 14:01 (HH:MM - 24 hours based)

[jgonsior]

Perfect, that's what I wanted to report in #2175, but apparently @dalins image was more understandable than my text.

[jkelly99]

I have the same issue with setting Ireland as my locale and still having Sunday as the first day of the week instead of Monday.
Nextcloud 19.0.0
Calendar app 2.0.3