BIP0039 added Spanish wordlist

[Y75QMO]

These are a some of the restrictions we have followed in order to create the Spanish wordlist:

1. It is possible to uniquely identify a word just typing the first four or less characters of the word.
2. Spanish words have special characters (such as á, é, ü, ñ, etc.) not available in every keyboard. It is possible to type 'a' instead of 'á' or 'n' instead of 'ñ', etc. while still being able to identify the word with the first 4 characteres. This means that, for example, 'caña' and 'canal' cannot be both in the wordlist.
3. There are some combinations of letters that sound similar. There cannot be two words that only differenciate on those combinations of letters. For example, 'hola' and 'ola' cannot be both in the wordlist. 'quiosco' and 'kiosko' cannot be both in the wordlist.
4. Only standard form of verbs (infinitive), nouns and adjetives are in the list.
5. The more common words are preferred over less common words.
6. Shorter, simpler, words are preferred over longer words. For example 'libro' is prefered over 'librería'

There are more restrictions. The full set of restrictions is defined in python here: https://github.com/Y75QMO/Tests-for-BIP39-Spanish-wordlist.

We have scanned using software more than 600,000 words and manually reviewed one by one more than 40,000 words. Choosing 2,048 and following all the rules is not an easy task and more than one list is possible. Any help or review of the wordlist is appreciated.

[laanwj]

Paging @voisine as (one of) the authors of BIP39, can you have a look at this change?

[voisine]

non-spanish speaking ack.

[voisine]

@Y75QMO you'll also probably want to add a link to the word list here: https://github.com/bitcoin/bips/blob/master/bip-0039/bip-0039-wordlists.md

[Y75QMO]

@voisine, I have added some comments regarding the Spanish wordlist and the link to the Spanish wordlist. Here is the pull request with the additions: #112

I am not sure my English is correct or the formatting is right. Please feel free to change my English if it can be improved.

[voisine]

@Y75QMO both this and #112 look good. I don't know if it's easier to add #112 to this PR or keep them separate, but the changes are fine. ACK

[bentobox19]

@laanwj we found an alarming high number (80+) of potentially offensive words in the spanish file, which makes the list simply unusable:

https://zerobin.net/?49c8b750a5e169ec#5HlYfF26q5PJivUZRyZvGHj554Y6DYICcNO56kxqPpE=

Request advice on how to fix this. Should we create a spanish-v2.txt and just submit a Pull Request?