Add multilanguage support to step definitions

[bartlangelaan]

🤔 What's changed?

This adds multilanguage support to step definitions. Fixes #117.

This means that you can now create an alias for step definitions, and use them.

For example, in JS you could write:

// helpers.js
export const Gegeven = Given;

// step.js
Gegeven('de homepage is open', () = {})

⚡️ What's your motivation?

Multilanguage support has already been added to the gherkin parser, which works fine. To make all sentences look right in code also, this is the missing piece of the puzzle.

🏷️ What kind of change is this?

• :zap: New feature (non-breaking change which adds new behaviour)

♻️ Anything particular you want feedback on?

Some parsers are defined differently, so I tried to keep everything intact as much as possible. This means that the original casing is preserved. If something should be changed, please let me know. I would love to see this functionality in the VSCode plugin!

📋 Checklist:

• [x] I agree to respect and uphold the Cucumber Community Code of Conduct
• [X] I've changed the behaviour of the code
  • [X] I have added/updated tests to cover my changes.
• [ ] My change requires a change to the documentation.
  • [ ] I have updated the documentation accordingly.
• [ ] Users should know about my change
  • [ ] I have added an entry to the "Unreleased" section of the CHANGELOG, linking to this pull request.

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