Implement ability to subscribe to a user

Closes #482 (closed)

Screenshot

mentioned in merge request !758 (closed)

I feel like "Subscribe" button is confusing, since what's the difference between "following" someone and "subscribing" to someone. Bell icon is familiar if you used youtube and you can put a tooltip there like "Receive notifications when this user posts" or something.

also, as i mentioned above

"Following" works because it continuous action. You can stop following or "unfollow" at any time. "Subscribing" sounds like you're in process of adding subscription. It's probably a valid use but more often you'll see "subscribed" then "subscribing". Again, youtube says "subscribed".

added 11 commits

• 1af4b3b7...e351f863 - 3 commits from branch pleroma:develop
• 5486191b - #482 (closed) - add new endpoints to subscribe to the user
• 31906615 - #482 (closed) - add subscribe button
• 4e0abb54 - migrate SubscribeButton to the existing common component
• 03ad795c - add subscribing to user entity normalizer
• ed0a51bf - show text in progress only when slot is given
• 5f07845a - mutate updated relationship to the store
• 5815a070 - show subscribe button only if user is logged in
• 80422a56 - support i18n

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@hj I agree, "Subscribed" is more correct.

added 2 commits

• dfd23380 - update copy
• c439702c - change subscribing to subscribed

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• 88c0b06d - no need to covert to boolean

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resolved all discussions

@hj Where do you suggest to put the "Bell" icon?

let's try to put the icon right next to the "external" icon in the upper right corner.

had something like this in mind. I'd make some better mockups for possible solutions and ask people around in #pleroma-dev-ux

Is this vidme?

agreed that the bell icon would be best

added 1 commit

• 304f1d1c - clean up UserCard template

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• 1259b9a3 - clean up UserCard css
• 9dc5033a - clean up layout

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added 3 commits

• fcf0fb8d - clean up + add btn-group css class
• 454f530f - add bell-off font icon
• 72df58b5 - change subscribe button to icon button

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