[Enhancement] Add female and double grunts

[Tempo-anon]

What are the changes?

• Allowed female grunts to show up (cosmetic change)
• Allows evil team grunts to spawn as double battles
• Did some code refactoring
• Added localization for languages without the grunt translations

Why am I doing these changes?

We had the assets for this but never implemented it

What did change?

• battle.ts
  • Added documentation to getRandomTrainerFunc
  • Added a new optional randomGender variable to getRandomTrainerFunc
  • The previous double battle code was never working (and also had a bug) but I repurposed it to only work for evil team grunts
• Localizations

• EN
• DE
• ES
• FR
• IT
• KO
• PT_BR
• ZH_CN
• ZH_TW

Screenshots/Videos

Female grunts generating alongside male grunts

Double grunts

How to test the changes?

Override to wave 61

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?
• Have I tested the changes (manually)?
  • Are all unit tests still passing? (npm run test)
• Are the changes visual?
  • Have I provided screenshots/videos of the changes?

[Adri1]

Added French (+tiny correction on existing translation)

[frutescens]

Think it looks good!

[NicusPulcis]

Italian localization