api/translations/:code does not return custom language variables

[renestalder]

Describe the bug

As previously discussed in the forum, the api/translations/:code endpoint returns all translations, including plugins, but doesn't return custom language variables as defined in the translations field of e.g. site/languages/de.php.

To Reproduce
Steps to reproduce the behavior:

1. Define custom language variables in one of your translation files, e.g. site/languages/de.php:

   <?php
   
   return [
       'code' => 'de',
       'default' => true,
       'direction' => 'ltr',
       'locale' => [
           'LC_ALL' => 'de'
       ],
       'name' => 'Deutsch',
       'translations' => [
           'labelname' => 'Name',
           'labelemail' => 'E-Mail',
           'labelresidence' => 'Wohnort',
           'labelquestion' => 'Frage stellen',
           'labelquestionsubmit' => 'Frage einsenden'
       ],
       'url' => ''
   ];

2. Query the api/translations/de endpoint

Expected behavior
The result set of the API request to include the custom language variables.

Screenshots
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Kirby Version

3.5.0

Console output

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Additional context
–

cc @distantnative

[bastianallgeier]

✅

[renestalder]

:cool: :cool: :cool:

Looking forward to that. Already had to write a copy and parser task that moves the translations from the Kirby PHP project over to the decoupled front-end to work around it.

Very appreciated that this already went through the pipeline. Thank you.