internationalise comment shortcut fixes #1167

[ArztKlein]

Fixes #1167

Changes: Adds an extra shortcut for the comment - ctrl + . so that people using the german keyboard (and alike) can use a shortcut.

I have verified that this pull request:

• [x] has no linting errors (npm run lint)
• [x] has no test errors (npm run test)
• [x] is from a uniquely-named feature branch and is up to date with the develop branch.
• [x] is descriptively named and links to an issue number, i.e. Fixes #123

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• p5.js-web-editor
  • app-ted6805-p5-js-web-editor.rls.sh
  • preview-ted6805-p5-js-web-editor.rls.sh

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