fix: add type for locale in @IsAlphanumeric and @IsAlpha decorators

[ufec]

Description

The first parameter of IsAlphanumeric and IsAlpha decorator does not have correct prompt

The effect after modifying the parameter type is as follows:

We can clearly see which values can be selected for the first parameter

Checklist

• the pull request title describes what this PR does (not a vague title like Update index.md)
• I have run the project locally and verified that there are no errors
• the pull request targets the default branch of the repository (develop)
• the code follows the established code style of the repository
  • npm run prettier:check passes
  • npm run lint:check passes
• tests are added for the changes I made (if any source code was modified)
• documentation added or updated

Fixes

fixes #1739

[braaar]

This change is already included in #1519, but this PR can be merged on its own, as well.

[NoNameProvided]

Thanks! Landed in 5b0b962 and 72d1eed.

[github-actions]

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