[HttpKernel] allowed any callable to be returned by ControllerResolver::createController
[Translation] fixed a unit test
Merge branch '2.2'

* 2.2:
  [Translation] fixed a unit test
merged branch fabpot/callable (PR #7739)

This PR was merged into the master branch.

Discussion
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[HttpKernel] allowed any callable to be returned by ControllerResolver::createController

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

Commits
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8c44768 [HttpKernel] allowed any callable to be returned by ControllerResolver::createController