Translated strings in ladder section to Ukrainian
Turning off signup title and description A/B tests

These have been on a long time.  Using short title and no description.

Data from Mixpanel:
Description on:
no 42.09
yes 41.91
Title length:
short 42.26
long 41.74
Add missing signup tracking data

And add level to subscription tracking data where appropriate.
Update subscribe copy

To be more inline with free track + subscription practice/bonus levels.
Update uk.coffee
Update payments-view.jade
Update en.coffee
Merge pull request #1870 from Rarst/patch-1

Translated strings in ladder section to Ukrainian
Merge pull request #1872 from ImmortalJoker/patch-3

Update uk.coffee
Merge pull request #1873 from Imperadeiro98/patch-1

Update payments-view.jade
Fixed #1875.
Merge branch 'master' into production