frameworks: base: grammar fixes

props to  Boštjan Mejak for letting JIRA know.

JIRA issue: CYAN-4913

Change-Id: I09b742b1935b7ae5a2588ddc2c8c529e4bac0664
Allow translucent navigation bar in landscape mode.

Change-Id: I5388f3f8a34533624619714bacfba52f95fc6d85