[Translation:update][Xliff Dumper] added target-language.

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | #11218
| License       | MIT
This implementation has an issue: if you dump once with a default locale, and a second time without passing a default locale, the second dump will be affected by the default locale of the first dump, because you made the dumper stateful