fix: expose locale support for isAlpha and IsAlphanumeric decorator

[TheNoim]

isAlpha and isAlphanumeric are not useful in an non english country if they don't support the locals argument like validator.js does.
This package is based on validator.js, so why are locals not supported?

import { IsAlphanumeric } from 'class-validator';

export class Target {
    @IsAlphanumeric('de-DE')
    name: string;
}

This needs to be possible.

[rubiin]

Looking at the validator source code. It has a set of regex for all locales which it compares it with to determine a valid alpha and alphanumeric while in case of here, it is just comparing using instanceof. I would be happy to code this feature

[vlapo]

It is simple fix. Feel free create PR. Check e.g. isMobilePhone validator. Its a same principe.

[rubiin]

sure. I will work on it at my free time and create a pr

[rubiin]

added that on pr #406

[rubiin]

@vlapo @NoNameProvided I have added the fix

[lock]

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