Add action to create or open translation file dynamically

[wottpal]

Closes #850.

Changes

• Adds new command to create or open translation file (depending on whether it exists or not)
• Replaces behavior of i18n button in file action/top bar but keeps the frontMatter.i18n.create command for backwards
• Tested in my personal project(s)

Screenshot

Minor Issue

This is unrelated to my new command/action as it already happens with frontMatter.i18n.create: I get the commandsI18nCreateErrorNoContentFolder error quite often. But always if it happens, I can just press the button a few more times and then it works again. Do you have any idea how to resolve this, @estruyf?

[estruyf]

Thanks @wottpal 🙏

I found the issue with the commandsI18nCreateErrorNoContentFolder as well. It was related to the page folder cache, which can get cleared, and if you try to fetch the page folders at that moment, none exist. I have changed this behavior to fetch it from the cache, and if it's empty, try to fetch it on the fly.

[estruyf]

I manually merged it to the beta branch, and it is now testable in the latest beta version.