I18N: Add script to generate translated android strings.xml, automatically generates fake cpp file #4831
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Description
Fixes: https://trello.com/c/EiKn4pYx/36-error-warning-and-info-messages-in-stringsxml-should-be-translate-able-via-the-weblate
This PR adds a python script that generates the translated strings.xml as per this specs: https://developer.android.com/guide/topics/resources/providing-resources#AlternativeResources
Also, this script automatically generates the fake cpp for the gettext (to make it translatable for weblate) using
res/values/strings.xml.Relevant translated strings.xml file will be automatically used based on the android system's language.
Testing
For testing, I manually added the string for the permission denied toast in the original and some generated XML (I also edited the relevant code to use string resource instead), and it works as expected.
Here are some screenshots of the android app:
Default:

Using Catalan system's language (same build):

Using Japanese system's language (same build):
