[Translator][FrameworkBundle] Added @ to the list of allowed chars in Translator
bug #11403 [Translator][FrameworkBundle] Added @ to the list of allowed chars in Translator (takeit)

This PR was squashed before being merged into the 2.3 branch (closes #11403).

Discussion
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[Translator][FrameworkBundle] Added @ to the list of allowed chars in Translator

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11396
| License       | MIT

Commits
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3176f8b [Translator][FrameworkBundle] Added @ to the list of allowed chars in Translator