Fix translation

| Q             | A
| ------------- | ---
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | -
| License       | MIT
| Doc PR        | -

Have no clue why the BlockBundles translation is used for the translation in sonata-admin-blocks, but i got an error after the last `composer update` that the translation file can't be parsed, this PR fixes that problem.
why do you remove this? looking at the new file, it seems this is not duplicated... what is the issue?