Missing translation default

[hylke94]

Would it be possible (probably it could) to add a config option to the translator with a default fallback text for missing translations?

For example:

// current working (without translation)
echo trans('home.welcome'); // Outputs: "home.welcome"

// desired working (without translation)
config(['translator.missing_text'=>'TRANS_MISSING']);  // Setting a config with the default return text on empty translation
echo trans('home.welcome'); // Outputs: "TRANS_MISSING"

(Or in the app config. Now I see the locale settings are in there..)

With this feature we could show the developers easier that there is missing a translation. Also on for example, Cypress testing, we could just do a quick scan over all pages to search for this missing translation placeholder.