InputNumber:format error when Locale set de-DE

[kl-nevermore]

Describe the bug

when I fix #4802 I found new problem caused by #5608

Bug 1

Bug 2

Reproducer

No response

PrimeReact version

master

React version

17.x

Language

TypeScript

Build / Runtime

Create React App (CRA)

Browser(s)

No response

Steps to reproduce the behavior

bug2

1. delete all
2. input to format
3. keypress arrow right or decimal(. ,) 1time
4. cursor not move
5. keypress again
6. worked!

No response

Expected behavior

[kl-nevermore]

@melloware I found another problem,can you confirm if passed a " " to ObjectUtils.isLetter return true is correct

it's should be 1,00

primereact/components/lib/inputnumber/InputNumber.js

Line 676 in aac57b8

const suffix = ObjectUtils.isLetter(value[end]) ? end - 1 : end;

[melloware]

That seems like a bug I think isLetter should be this instead.

    static isLetter(char) {
        return return /^[a-zA-Z\u00C0-\u017F]$/.test(char);
    }

That picks up ...

// Example usage:
console.log(isLetter('A'));      // true
console.log(isLetter('é'));      // true
console.log(isLetter('Г'));      // true
console.log(isLetter('5'));      // false
console.log(isLetter('!'));      // false
console.log(isLetter(' '));      // false
console.log(isLetter(undefined));      // false