Fix contrast on some buttons and nagivation text
Fix contrast on some buttons and nagivation text

Bug: 37518133
Bug: 37518368
Change-Id: Ibe0ace3065f09fa5c7b0a1c2e9dbfd15c2652250

jarekankowski/iosched,jarekankowski/iosched,jarekankowski/iosched,WeRockStar/iosched,WeRockStar/iosched,WeRockStar/iosched