Test graceful handling of string translations subkeys/replacements
Test graceful handling of string translations subkeys/replacements

This allows certain translation-packages to simplify complex
translation keys down to a simple string without causing breakage.

Example use-cases include:
* writing simpler i18n files for languages that simply don't
  have the concept of pluralization.
* Shorthanding `subkey`ed translations where all subkeys should
  have the same text.

StephanHoyer/translate.js,StephanHoyer/translate.js,StephanHoyer/translate.js