Var component: Not clear how concatenation works

[ptgott]

The spacing of the Var component makes it difficult for users to tell how text within the component will be concatenated with text on either side.

For example:

It's not clear whether there will be spaces between the = and the Proxy Service address and between the Proxy Service address and the port.

We should change the presentation of the Var component to be more explicit about the text that it will paste.