Fix for ReflectionException Class translator does not exist

[DoDSoftware]

Calling trans() here now throws ReflectionException Class translator does not exist.
Defaulting to "All " to avoid this issue. It's easy enough to change if the user needs to.

#1252 (comment)

[DoDSoftware]

It seems this issue was introduced in:

[3.3.11] - 2018-02-23

• added config('backpack.crud.page_length_menu') config variable;

[tabacitu]

Looks good to me!

[welcome]

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[tabacitu]

OMG, thank you so much @DelightedD0D ! It is so weird that it does not trigger the error in the package config, but it does trigger it in the app config. I had no idea, and it did not come up in my testing. I just hope this didn't mess up too many people's first experience with Backpack. As I understand it, this triggered an error as soon as someone installed Backpack...

I just merged your PR and tagged it, it's available with a composer update.

Cheers and kudos to you for providing a PR! Thank you.