Allow Admins to edit system message content

[amykirschner]

Problem/Task: The content of auto-generated messages cannot be edited by the admin. This functionality should be added to the admin dashboard

Requirements:

• [ ] There should be a tab on the admin dashboard called forms/messages
• [ ] The forms/messages tab should contain a list of all existing messages
• [ ] The admin should be able to edit the text of the following messages
• Bids (defined in bid.rb):
• • [ ] offered
• request name
• request url
• • [ ] accepted
• request name
• request url
• • [ ] committed
• request name
• request url
• • [ ] completed
• request name
• request url
• • [ ] Payments (defined in exchange.rb):
• - [ ] Send payment notification to worker
• payment amount
• payment name
• • [ ] Send suspend payment notification to worker
• payment amount
• payment name
• [ ] Message templates should support special values specific to that message (see above)
• [ ] Message templates should have default values that mimic the existing text.
• [ ] There should be an embedded wysiwyg editor for messages that supports rich text (links, colour, etc).
• [ ] Each message should have a preview button that shows an example of the message with the new template.

(with @davefp). Replaces #429

[rapsad]

The first 3 from the top are done. But I have problem with request url. There are unique so the thing is to give the opportunity to hook some new request? @davefp can you look at this?

[davefp]

@rapsad The admin should be able to provide a template with a placeholder for the request URL (and any other dynamic field).

For example, an admin might specify the following as a template:

Bid accepted for {{request_name}}

The {{request_name}} portion will be replaced with the actual value at runtime.

Mustache might be a good choice for a straightforward templating engine. Liquid is another good choice.

[rapsad]

Hello @davefp I don't know why but I made up some changes but they are not connected to this issue but for this pull request: https://github.com/oscurrency/oscurrency/pull/592