Improvements and additional features

[mrkvon]

This issue was created by @agatatalita and moved here from ditup/ditapi#38

• being able to choose the tag from tags page and easily add it to "my tags", also from other user's tags.
  Could be popup with options: see tag page, add to my tags.
  As a first step, there could be "add to my tags" option on tag's page.
• direct easily accessible link to "my contacts" - maybe in "people" but I would expect it more in the menu on the right - personal menu, now it is not so easy to access (bc10d27)
• notification about new contact requests should be done like in messages, could be over the link to the "my contacts" page
• reference for the user could be shown somewhere on the contact page. Possibly in smaller text next to picture or in some popup with contact. (bc10d27)
• feedback functionality
• some help explaining e.g. colors of signs next to peoples contact pictures (bc10d27)
• if there will be ever an issue with too many loaded messaged at once, it would be nice to solve it with navigating with pages (not scrolling up and loading more),