Platform.Bible extension strings not in Crowdin

We need to add https://github.com/sillsdev/languageforge-lexbox/blob/develop/platform.bible-extension/contributions/localizedStrings.json to the https://crowdin.com/project/language-depot source files. Crowdin can handle the format and correctly extract the strings for translation, using their keys (the string ids) for context.

There are a couple complications:

• We only want the "en" section of localizedStrings.json considered for source strings
• The translations will be:
  • either downloaded one .json file per language, which need to be merge into their respective sections in localizedStrings.json;
  • or downloaded as a single XLIFF file, which we'll then need to convert into the right .json format

Start by inspecting platform.bible-extension/contributions/localizedStrings.json and the existing Crowdin source-file configuration for language-depot. Determine how to expose only the en section and whether per-language JSON or XLIFF downloads fit the repository workflow. Done means source strings are available in Crowdin and downloaded translations are merged into the corresponding language sections.