Disable spell check for account and commodity names

[flux77]

Please disable spell checking in account names and commodity names. It's a bit silly that currency codes (e.g. CNY, JPY) and bank names (e.g. ICBC, Mizuho) are considered "spelling mistakes" in account and commodity names.

Example where all account and commodity names are considered "spelling mistakes":

account Assets:GiantBank
account Income:MegaLoto

commodity CNY
commodity JPY

2022-01-01 Won the lottery
    Assets:GiantBank  1234 JPY
    Income:MegaLoto

[alerque]

Sounds fair enough! I'm a bit busy ATM but I should be able to facilitate a PR along these lines if somebody submits one.