Revert "Russian T9 for Dialer"

This reverts commit 8e9e4538ce4cfb0c5111f1e5793b178a65772c18.
Revert "improve readability"

This reverts commit fe7156dbac553ddcceb645eb2710b12f47e1b13e.
Revert "Dialer: improve letters' readability"

This reverts commit b270254aabd688ca826c922351caf9e3b861e1f6.