[Interface-name] Always prefix return error for II18nConfig interface

[artberri]

Bug Report

• TSLint version: 5.15.0
• TypeScript version: 3.3.3333
• Running TSLint via: gulp-tslint

TypeScript code being linted

export interface II18nConfig {
    defaultLang: string;
    storageKey: string;
    languages: string[];
    dataStorageKey: string;
    dataLanguages: string[];
}

with tslint.json configuration:

{
    "rules": {
        "interface-name": [
            true,
            "always-prefix"
        ]
    }
}

Actual behavior

Throws error: interface-name interface name must start with a capitalized I

Expected behavior

No error, II18n... should be an allowed word.

Related issue

[Interface-name] Never prefix return error for I18nInterface #4476

[adidahiya]

Duplicate of #4476