Fix fallback mechanism for ICU translations

[dolmit-tanel-paaro]

Changes in this pull request

Fixes the fallback mechanism for ICU translations.

Steps to reproduce

1. Define fallback language for one of the locales, for example de fallbacks to en
2. Create ICU translation; set value for the fallback language (en) and leave empty for the language having the fallback (de)
   • example CSV:

   "key";"de";"en"
   "someKey";"";"{count, plural, one {One} other {Other} }"
   

3. Execute this Twig code

<div>{{ 'someKey'|trans({count: 1}, null, 'en') }}</div> // output: "One"
<div>{{ 'someKey'|trans({count: 1}, null, 'de') }}</div> // output: "{1, plural, one {One} other {Other} }"

The fallback mechanism works but partially.
The displayed string is unformatted - that's why we have to use Symfony's translator to return correctly formatted string.

Steps to reproduce

I discovered this issue on Pimcore v10.6.9.
Tested this issue on the latest Pimcore Demo docker image.

[github-actions]

Review Checklist

• Target branch (11.2 for bug fixes, others 11.x)
• Tests (if it's testable code, there should be a test for it - get help)
• Docs (every functionality needs to be documented, see here)
• Migration incl. install.sql (e.g. if the database schema changes, ...)
• Upgrade notes (deprecations, important information, migration hints, ...)
• Label
• Milestone

[sonarqubecloud]

Quality Gate passed

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[martineiber]

LGTM 👍
Thank you for your contribution.