[Translation] added method to expose collected messages
feature #9859 [Translation] added method to expose collected message (Grygir)

This PR was merged into the 2.6-dev branch.

Discussion
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[Translation] added method to expose collected message

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | no
| Fixed tickets | #2435
| License       | MIT
| Doc PR        | symfony/symfony-docs#3386

Commits
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ef5d7c5 [Translation] added method to expose collected messages