[Refactor][Localization] Better handling for StatusEffect.NONE with i18n

[flx-sta]

Found this inconvenience for translators with @CodeTappert

What are the changes the user will see?

None

Why am I making these changes?

Currently there is the necessity in translation of a few empty keys.
Quite inconvenient and useless. Reason for that is to handle the theoretical situation of statusEffect:none.<obtain | heal etc.> _{Which realistically never occurs afaik}

What are the changes from a developer perspective?

1. All getStatusEffect<...>Text() methods now check for StatusEffect.NONE to simply return an empty-string ""
2. Removed all those (now) obsolete keys from status-effect.json file/s
3. Fixed the tests (Which ironically will be removed in i18n-lazy-load anyway)

How to test the changes?

You can't really. Just set a status and remove it again and see if something odd happens.

Example Overrides

const overrides = {
  OPP_MOVESET_OVERRIDE: Moves.THUNDER_WAVE,
  MOVESET_OVERRIDE: [Moves.REFRESH]
} satisfies Partial<InstanceType<typeof DefaultOverrides>>;

Checklist

• I'm using beta as my base branch
• 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 considered writing automated tests for the issue?
• If I have text, did I make it translatable and add a key in the English locale file(s)?
• Have I tested the changes (manually)?
  • Are all unit tests still passing? (npm run test)