No Fedora messages bein generated for plural translations

[jojurajan]

Describe the bug

Fedora messages are not being generated for plural string updates.

To Reproduce

Steps to reproduce the behavior:

1. Go to 'Project' -> 'Component' -> 'Source-Language'
2. Upload a plural string
3. Go to 'Project' -> 'Component' -> 'Translated-Language' -> 'Translate'.
4. Add a plural translation

Expected behavior

A Fedora message is sent out with the updated plural translation.

Server configuration and status

* Weblate: 4.3-dev
 * Django: 3.1.1
 * siphashc: 2.1
 * Whoosh: 2.7.4
 * translate-toolkit: 3.1.1
 * lxml: 4.5.2
 * Pillow: 7.2.0
 * bleach: 3.2.1
 * python-dateutil: 2.8.1
 * social-auth-core: 3.3.3
 * social-auth-app-django: 4.0.0
 * django-crispy-forms: 1.9.2
 * oauthlib: 3.1.0
 * django-compressor: 2.4
 * djangorestframework: 3.11.1
 * django-filter: 2.3.0
 * django-appconf: 1.0.4
 * user-agents: 2.2.0
 * filelock: 3.0.12
 * setuptools: 40.8.0
 * jellyfish: 0.8.2
 * openpyxl: 3.0.5
 * celery: 4.4.7
 * kombu: 4.6.11
 * translation-finder: 2.2
 * html2text: 2020.1.16
 * pycairo: 1.16.2
 * pygobject: 3.30.4
 * diff-match-patch: 20200713
 * requests: 2.24.0
 * django-redis: 4.12.1
 * hiredis: 1.1.0
 * sentry_sdk: 0.17.8
 * Cython: 0.29.21
 * misaka: 2.1.1
 * GitPython: 3.1.8
 * borgbackup: 1.1.13
 * pyparsing: 2.4.7
 * Python: 3.7.3
 * Git: 2.20.1
 * psycopg2: 2.8.6
 * psycopg2-binary: 2.8.6
 * phply: 1.2.5
 * chardet: 3.0.4
 * ruamel.yaml: 0.16.12
 * tesserocr: 2.5.1
 * akismet: 1.1
 * boto3: 1.15.4
 * zeep: 3.4.0
 * aeidon: 1.7.0
 * iniparse: 0.5
 * mysqlclient: 2.0.1
 * Mercurial: 5.5.1
 * git-svn: 2.20.1
 * git-review: 1.28.0
 * Redis server: 3.0.6
 * PostgreSQL server: 10.12
 * Database backends: django.db.backends.postgresql
 * Cache backends: default:RedisCache, avatar:FileBasedCache
 * Email setup: django.core.mail.backends.smtp.EmailBackend: email1.ldc.yougov.local
 * OS encoding: filesystem=utf-8, default=utf-8
 * Celery: 
 * Platform: Linux 4.15.0-112-generic (x86_64)

Weblate deploy checks

WARNINGS:
?: (security.W019) You have 'django.middleware.clickjacking.XFrameOptionsMiddleware' in your MIDDLEWARE, but X_FRAME_OPTIONS is not set to 'DENY'. Unless there is a good reason for your site to serve other parts of itself in a frame, you should change it to 'DENY'.

INFOS:
?: (weblate.I028) Backups are not configured, it is highly recommended for production use
	HINT: https://docs.weblate.org/en/latest/admin/backup.html

[nijel]

I think the messages are generated, but are discarded somewhere because plurals are separated by control chars.

[github-actions]

Thank you for your report, the issue you have reported has just been fixed.

• In case you see a problem with the fix, please comment on this issue.
• In case you see a similar problem, please open a separate issue.
• If you are happy with the outcome, consider supporting Weblate by donating.

[nijel]

I think I've just fixed this. Please note that this will change payload of the messages wherever string (source or translation) is it will now be sent as an array instead of a string.