feat: add missing and fix incorrect Calendar 1999 challenge translations

[Clarity-89]

Add:

• CalendarKillEnemiesHard (Even the odds / Kill 1,000 Enemies)
• CalendarKillEnemiesWithAbilitiesEasy (Demonstration of power / Kill 150 Enemies with Abilities)
• CalendarKillEnemiesWithMeleeHard (By The Blade / Kill 500 Enemies with Melee Weapons)
• CalendarKillEnemiesWithMeleeMedium (By The Blade / Kill 300 Enemies with Melee Weapons)
• CalendarKillEximusMedium (EX-EXIMUS / Kill 20 Eximus)
• CalendarKillScaldraEnemiesWithMeleeHard (Make it personal / Kill 250 Scaldra Troops with Melee Weapons)
• CalendarKillTechrotEnemiesWithAbilitiesEasy (Null and Void / Kill 100 Techrot with Abilities)
• CalendarKillTechrotEnemiesWithAbilitiesHard (Null and Void / Kill 300 Techrot with Abilities)
• CalendarKillTechrotEnemiesWithMeleeEasy (Electronic waste Disposal / Kill 100 Techrot with Melee Weapons)
• CalendarKillTechrotEnemiesWithMeleeHard (Electronic waste Disposal / Kill 300 Techrot with Melee Weapons)

Fix:

• CalendarKillScaldraEnemiesEasy: 250 -> 150 Scaldra Troops
• CalendarKillScaldraEnemiesWithMeleeMedium: 300 -> 150 Scaldra Troops with Melee Weapons
• CalendarKillTechrotEnemiesHard: 1,000 -> 750 Techrot

Data taken from https://wiki.warframe.com/w/1999_Calendar

Considerations

• Does this contain a new dependency? [No]
• Does this introduce opinionated data formatting or manual data entry? [No]
• Does this pr include updated data files in a separate commit that can be reverted for a clean code-only pr? [Yes]
• Have I run the linter? [Yes]
• Is is a bug fix, feature request, or enhancement? [Enhancement]

Summary by CodeRabbit

• New Features

  • Added new calendar challenges including variants for killing enemies with abilities, melee weapons, and expanded Techrot enemy challenges across multiple difficulty levels.

• Updates

  • Modified descriptions and target values for select calendar challenges to improve difficulty scaling and accuracy.

[coderabbitai]

📝 Walkthrough

Walkthrough

This PR modifies data/languages.json to introduce new calendar challenge entries across multiple difficulty tiers (Easy, Medium, Hard) for various kill types, updates existing challenge descriptions with adjusted numeric thresholds, and expands calendar upgrade descriptions with duplicated emphasis text.

Changes

Cohort / File(s)	Summary
Calendar Challenge and Upgrade Entries data/languages.json	Added 10+ new calendar challenge entries under Calendar1999 with varying difficulty tiers (Kill Enemies, Kill Eximus, Kill Techrot, Kill Scaldra, and ability/melee variants). Updated existing entries with normalized values (EX-EXIMUS → Ex-Eximus) and adjusted numeric thresholds. Expanded AbilityStrength upgrade description with duplicated stat gain text.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• fix: add string data for archimedea, calendar challenge, and prime vault #730: Adds calendar challenge strings and faction names (Scaldra/Techrot) to the same localization data structure.
• fix: add more calendar challenges, overrides, and baro items #620: Updates calendar challenge entries and calendar upgrade language entries in the same file.
• feat: add language strings for more calendar challenges, rewards, and overrides #609: Adds and renames multiple CalendarKill* keys and Calendar/AbilityStrength upgrade text with similar modifications.

Suggested reviewers

• TobiTenno
• SlayerOrnstein

Poem

🐰 Calendar quests bloom in winter's chill,
With Techrot foes and Eximus to kill!
Difficulty tiers dance in rhythm true,
Challenges multiplied—old quests made new!
Upgrades stack and abilities gleam,
More battles await in every challenge scheme! 🎯

🚥 Pre-merge checks | ✅ 4

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main changes: adding missing Calendar 1999 challenge translations and fixing incorrect values.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Merge Conflict Detection	✅ Passed	✅ No merge conflicts detected when merging into master

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✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@data/languages.json`:
- Around line 563-570: The JSON shows the keys CalendarKillEximusEasy and
CalendarKillEximusHard changed their "value" from "EX-EXIMUS" to "Ex-Eximus";
verify the correct in-game casing for Eximus (check game assets or localization
source) and then either (a) update the PR description to reflect the new
"Ex-Eximus" text (including the Medium entry mention) or (b) revert the two
entries back to "EX-EXIMUS" if the original was correct; reference
CalendarKillEximusEasy, CalendarKillEximusMedium, and CalendarKillEximusHard
when making the PR description or JSON update so all three entries are
consistent.

[github-actions]

🎉 This PR is included in version 3.4.0 🎉

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

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