[FrameworkBundle] fixed regression for the translator fallback configuration (refs #7100, closes #7315)

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #7315
| License       | MIT
| Doc PR        | n/a