Bangla Language Convert to slug

Description

When converting Bangla (Bengali) text into a slug using slugify, the output does not generate an expected transliterated slug. Instead, it either returns an empty string or improperly formatted characters.

Steps to Reproduce

1. Run the following code:

   const slugify = require("slugify");
   console.log(slugify("বাংলা ভাষা পরীক্ষা"));
   
   

Expected output:

A transliterated slug such as bangla-bhasha-porikkha

Actual Output

slug: Empty String

Expected Behavior

Bangla text should be converted into a readable, SEO-friendly slug using transliteration instead of being ignored or broken.

Reproduce the reported result with the JavaScript slugify("বাংলা ভাষা পরীক্ষা") snippet and inspect the repository's conversion path; the issue names no files or tests. Done means Bangla input produces a readable transliterated slug such as bangla-bhasha-porikkha without empty or malformed output, with coverage for this example.