core: RU translation

Change-Id: Ieffc693827aea4fc7a0e036e3cbd78924c691acb
core: SK translations

Change-Id: Ic9522a57a058d6b2afee194d3780d25939bfa492
Merge "core: SK translations" into cm-10.2
Merge "core: RU translation" into cm-10.2
Merge remote-tracking branch 'upstream/cm-10.2' into cm-10.2