TODO: sophisticated cognates identification

[oserikov]

• [X] align word embeddings
• [x] create bilingual semantic clusters
• [x] create semantic clusters
• [x] learn transliteration
• [ ] transliterate semantic clusters
• [ ] extract cognate clusters from semantic clusters
• [ ] merge into calma/cognates-boost branch

[erba994]

@oserikov can I take over on this indipendently or it is a dead-end and should be removed?