Rename DAE to DAO

[s-ben]

This PR renames the Decred 'Decentralized Autonomous Entity (DAE)' to the Decred 'Decentralized Autonomous Organization (DAO)' ( Closes #680 ).

[jholdstock]

A few places still need updating:

dcrweb/src/layouts/brief/list.html

Line 162 in da4bc7f

a major milestone in the road to a fully decentralized, autonomous entity.</p>

dcrweb/src/layouts/brief/list.html

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which to build up the Decred Decentralized Autonomous Entity which will ultimately

dcrweb/src/data/roadmap.yml

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description: "Stakeholder voting will allow funds to be allocated implement successful proposals. Decentralised Autonomous Entities (DAEs) will be able to take ownership of funds by way of a simple on-chain smart contract that delegates control over funds in a contract to a group of individuals."

dcrweb/src/data/roadmap.yml

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title: "Decentralized Autonomous Entities"

dcrweb/src/data/roadmap.yml

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description: "Add support for user-created decentralized autonomous entities (DAEs), with decentralized control of funds as their basis. Instead of focusing on speculative tokenization seen in \"ICOs\", a DAE will be built around an on-chain smart contract delegating control over funds to a group of individuals."

dcrweb/transifex_catalogs/en.json

Line 161 in da4bc7f

"home_guide_39": "<p>Part of the reward from new blocks goes towards the development of Decred to ensure that it will continually evolve to meet the needs and wants of the community now and in the years to come. These are just some of the features planned for 2018 and early 2019:</p><ul><li>Lightning network</li><li>Initial privacy release</li><li>Decentralized control of funds</li><li>Decentralized autonomous entities</li><li>Scalability optimizations</li><li>Decrediton integrations</li><li>Marketing growth</li><li>Proposal for a Decentralized Exchange</li></ul><p>Read about these and more on our blog. <a href=\"https://blog.decred.org\" target=\"_blank\" rel=\"noopener noreferrer\">Welcome to Decred: the future of autonomous digital currency</a></p>",