update RU strings (add helper dialogs)

In my (and my wife's:) opinion, the original English helper dialogs could use a little help (no offense intended).. Though we had our opinions, we did our best to keep true to the original strings and Android writing style guidelines.
And, when to use Halo or HALO)))? Since it was referring to the app we changed a couple lines to the latter.

Also, maybe another step explaining what the pinned apps actually do (or how they differ from the notifications) would help the user to better understand.