[Translation:update][Xliff Dumper] added target-language.
feature #11371 [Translation:update][Xliff Dumper] added target-language. (aitboudad, ClementGautier)

This PR was merged into the 2.6-dev branch.

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

Q | A
------------ | -------------
Bug fix? | yes
New feature? | yes
BC breaks? | no
Deprecations? | no
Tests pass? | yes
Fixed tickets | #11218
License | MIT

Complete this PR : https://github.com/symfony/symfony/pull/11252

Commits
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fdc3fb1 [Translation:update][Xliff Dumper] Reviewed code and replaced underscore by hyphen
1951412 [Translation:update][Xliff Dumper] added target-language.