License issue for the default alignment torchaudio models

[ir2718]

Hi,

I've noticed an issue regarding the licenses in this repository. The alignment.py file uses the following alignment models:

DEFAULT_ALIGN_MODELS_TORCH = {
    "en": "WAV2VEC2_ASR_BASE_960H",
    "fr": "VOXPOPULI_ASR_BASE_10K_FR",
    "de": "VOXPOPULI_ASR_BASE_10K_DE",
    "es": "VOXPOPULI_ASR_BASE_10K_ES",
    "it": "VOXPOPULI_ASR_BASE_10K_IT",
}

However, only the en model is under an MIT license, while the others (fr, de, es, it) are under a CC-BY-NC 4.0 license. I'm pretty sure a lot of people use this repository for commercial purposes as the code is licensed under a BSD-2-Clause license, and I would like to propose to replace the fr, de, es, and it models to commercially available equivalents.