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OpenFrontIO/resources/lang
Achim Marius 0793153f4e Standardize difficulty translation keys to easy/medium/hard/impossible (#2676)
Resolves #2673

## Description:

- This PR unifies difficulty naming by switching all difficulty
identifiers to a single lowercase set of keys (`easy`, `medium`, `hard`,
`impossible`) and aligning UI + translation keys (`en.json`) to match.
- The old UI labels (`"Relaxed"`, `"Balanced"`, `"Intense"`) have been
removed and replaced with the standardized difficulty terms (`Easy`,
`Medium`, `Hard`).

<img width="1312" height="306" alt="image"
src="https://github.com/user-attachments/assets/a59c5fae-f435-427d-b851-eef179a1e94f"
/>


## Please complete the following:

- [x] I have added screenshots for all UI updates
- [x] I process any text displayed to the user through translateText()
and I've added it to the en.json file
- [x] I have added relevant tests to the test directory
- [x] I confirm I have thoroughly tested these changes and take full
responsibility for any bugs introduced

## Please put your Discord username so you can be contacted if a bug or
regression is found:

assessin.
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