Add French Canadian locale

[max-vansteen]

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• [x] 🧪 Added tests for changed code.
• [x] 🛠️ All tests pass when run locally (run tox or make test to find out!).
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• [ ] 📚 Updated documentation for changed code.
• [x] ⏩ Code is up-to-date with the master branch.

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Description of Changes

Adds French Canadian Locale, with updated unit tests. Adds different month abbreviation for Fr_CA. Closes #436

[max-vansteen]

@systemcatch Yes, as far as I could find out this is the only difference here.