Plural rules (i18next v4) not working for Montenegrin

### Describe the issue

I am using i18next v4 json files for my translations. Among the languages I also have Montengrin (me.js)

In the file me.js I had a plural form of the following translation:
"episode_one": "{number} epizoda",
"episode_other": "{number} epizoda",
"episode_few": "{number} epizode",

However, Weblate for some reason requires the forms one, few, many:

When I save this translation string I lose the episode_few key from my source file, but episode_one and episode_other are kept.

### I already tried

- [X] I've read and searched [the documentation](https://docs.weblate.org/).
- [X] I've searched for similar filed issues in this repository.

### Steps to reproduce the behavior

1. Import me.js with correct plural rules into weblate:
```
"episode_one": "{number} epizoda",
"episode_other": "{number} epizoda",
"episode_few": "{number} epizode",
```
Weblate requires me to write entries:
- episode_one
- episode_few
- episode_many

### Expected behavior

Weblate requires entering of
- episode_one
- episode_other
- episode_few

### Screenshots

### Exception traceback

_No response_

### How do you run Weblate?

Other

### Weblate versions

Weblate 5.3.1

### Weblate deploy checks

_No response_

### Additional context

_No response_