Feature: Allow `null` as default value in translations

[tarlepp]

Is there an existing issue for this?

• I have searched the existing issues

Is your feature request related to a problem? Please describe

If we're eg. using some CI script to check if there is not translated keys using default value as like null is better than just a some "string" because if it's a string it might be proper translation itself - so using null for not translated keys is more specific.

Describe the solution you'd like

Allow to set null in --default-value option and also in transloco.config.ts configuration file.

Describe alternatives you've considered

No response

Describe alternatives you've considered

I think that I explained this already.

Describe alternatives you've considered

I think that I explained this already.

Additional context

Choosing "No" to "I would like to make a pull request for this feature" question - just because I don't know this library so well yet - just using this like couple hours - nothing else.

I would like to make a pull request for this feature

No