Internationalization (i18n) part 2

[DaleStan]

Part 2 of 2 for internationalizing Yafc. This extracts all translatable strings into yafc.cfg, and uses the same translation system that Factorio uses.
It also updates the Crowdin integration in a way that worked for me in a test project.

Code is generated based on the English files, to help prevent using undeclared translation keys or substituting the wrong number of parameters.

[DaleStan]

To make the Crowdin action work on the Github side, this repo will need the three secrets mentioned in crowdin-translation-action.yml.

When I was testing on the Crowdin side, the languages that use locale strings (e.g. zh-TW) needed a language mapping to change their two_letters_code to the locale string instead.

[shpaass]

Thank you for the feature! That's a lot of work. I'll review it this week.
All three security tokens are set up. Two entered manually, and the GITHUB_TOKEN is created automatically, from what the article says.