MMS: Update Polish language

PS1: Fix doubled string

Change-Id: Ib82545886ea285d281bbad9a5d838d7d596d3078
Fixed Latvian translation

Change-Id: Ifc7265c87963b1fb033056e048474757d1db801e
Merge "MMS: Update Polish language" into cm-10.1
Merge branch 'cm-10.1' of github.com:CyanogenMod/android_packages_apps_Mms into cm-10.1