OS details in wrong spot in User Agent in Epiphany

[Cassidy James Blaede]

It is conventional to format user agents like `Mozilla/[version] ([system and browser information]) [platform] ([platform details]) [extensions]` (see: https://en.wikipedia.org/wiki/User_agent#Format_for_human-operated_web_browsers).

Right now we're inserting "elementary OS/0.4 (Loki)" into the User Agent, but the space between "elementary" and "OS" is not valid there and the whole string is not in the system and browser information area.

So instead of:

```Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/602.1 (KHTML, like Gecko) Version/8.0 Safari/602.1 elementary OS/0.4 (Loki) Epiphany/3.18.5```

we should do something more like:

```Mozilla/5.0 (X11; Linux x86_64; elementary OS 0.4) AppleWebKit/602.1 (KHTML, like Gecko) Version/8.0 Safari/602.1 Epiphany/3.18.5```

if possible.

[Danielle Foré (danrabbit)]

After some discussion with Cody, sounds like this is a "Won't Fix"

[Michael Catanzaro (mike-catanzaro)]

We have a requirement for this in Fedora. There is a patch you can use in https://bugs.webkit.org/show_bug.cgi?id=162611 if you want. Note: if you patch WebKit, you will want to remove your customized Epiphany UA suffix so that it doesn't appear in the UA twice.

The patch actually implements:

(X11; elementary OS 0.4; Linux x86_64)

It might be safer to flip them around, like suggested in the first comment.