[Rpm-maint] [rpm-software-management/rpm] `find-lang.sh --generate-subpackages` generated package name might contain illegal letter '@' (Issue #4180)

[laokz]

laokz created an issue (rpm-software-management/rpm#4180)

When using rpmbuild to build a package, if the package installed a locale which name containing '@' letter, like,
 ```
%{buildroot}/usr/share/locale/be at latin/LC_MESSAGES/abcd.mo
```
`find-lang.sh --generate-subpackages` generated subpackage name would also containing '@'.  Then rpmbuild would complain that `error: line 17: Illegal char '@' (0x40) in: %package langpack-be at latin`.

[find-lang.sh](https://github.com/rpm-software-management/rpm/blob/master/scripts/find-lang.sh#L304) has this code to deal with subpackage name,
```
LANG=`echo $LOCALE|sed 's/_.*//'`
```
It puts all '_territory' variants of the same lang into one $LANG package. Could we also treat '@modifier' variants like this?

I've referenced the folloing infomation.
- https://wiki.archlinux.org/title/Locale
- https://unix.stackexchange.com/questions/720268/what-is-modifier-in-locale-name

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