Testfor command doesn't apply lang keys for custom entities.

Using the exact same resource and behaviour pack stack as a typically hosted world, using a testfor command selecting a custom entity will fail to translate custom names and just list the default translation key.

Steps to Reproduce:

1. Transfer a world with an addon containing custom entities to bedrock dedicated server.

2. Host the world and join the server.

3. Spawn any custom entity.

4. Run a testfor command with the custom entity spawned in the selector.

Observed Results:
The testfor command returns a list of entity translation keys (ie. Found entity.<namespace>:<id>.name, …).

Expected Results:
The testfor command should return a list of translated keys, matching the behaviour found in worlds hosted through the game (ie. Found <entityname>, …).