Request: Add support for more wordlist languages

[GBKS]

It looks like English, Spanish and Italian are currently supported. Would be great to add the other wordlists in BIP39.

Lack of language support can be problematic for non-English speakers. I often hear that backing up a wallet is so easy, you just need to write down 12 words. But it's a lot harder when you're Japanese and writing an english word is more like "drawing weird, unfamiliar shapes". A big accessibility issue that we can solve to make bitcoin security easier for many people around the world.

Since multi-language wordlists are not broadly supported, a first step could be to only support their import. If enough wallets do this, then adding support for the creation of mnemonics in other languages could be added. Phoenix and BlueWallet are currently adding the import support. More details on this here.

[moneymanolis]

@GBKS we are using Trezor's reference mnemonic implementation (https://github.com/trezor/python-mnemonic) and ran into trouble with the detection of some languages (see: trezor/python-mnemonic#98). This was fixed in this PR (trezor/python-mnemonic#99). So, we are basically waiting for a new version of this library and should then be able to quite easily implement all BIP39 languages.

[Aditi-Singh16]

Hi! I would like to work on this issue