[Translation] Made translation domain defaults in Translator consistent with TranslatorInterface
merged branch bschussek/fix-translator (PR #7915)

This PR was merged into the master branch.

Discussion
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[Translation] Made translation domain defaults in Translator consistent with TranslatorInterface

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

Commits
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90a20d7 [Translation] Made translation domain defaults in Translator consistent with TranslatorInterface