Manage account/organization/general settings

Hi folks! Trying to post at least some parts of the biggest project Smartcat https://smartcat.com/, wish me luck. The product has changed already a lot, because team do best and works fast, but my experience still has value, so, thanks for any hearts.

This parts was the biggest I do alone and the hardest, many levels, many nuances, many forks and conditions for each type of account and state. Start with the easiest one — general settings)