[Feature][ENV] make i18n debugging an optional env setting

[flx-sta]

What are the changes?

I've made i18n debugging an optional setting that can be changed via .env files

Why am I doing these changes?

It's spamming the console but more importantly adding noise to the test-result output (a huge object in every test)

What did change?

i18n is no longer always in debug mode but can be forced into it by changing VITE_I18N_DEBUG to the value 1

Screenshots/Videos

How to test the changes?

1. Launch the local game as usual
2. Check the console in the browser: no i18n output
3. Open .env.development
4. Change VITE_I18N_DEBUG to the value 1
5. Restart local client
6. Check console: it should print i18n stufff

Checklist

• There is no overlap with another PR?
• The PR is self-contained and cannot be split into smaller PRs?
• Have I provided a clear explanation of the changes?
• Have I tested the changes (manually)?
  • Are all unit tests still passing? (npm run test)
• [] Are the changes visual?

[torranx]

lgtm

[flx-sta]

@Tempo-anon can this be considered ready for merge?

[CodeTappert]

This should be default ON.

So we can easier see which strings did not load correctly in the console