Improve NL translation

Rename 'Achtergronden' to 'Achtergrond', this fits nicer. One line in stead of two.

Change-Id: If872dd9a19b636645c18a94ddd4a5a6df6bd78c1
Fix CustomContent display issue.

During certain transition animations, the X offset value is computed,
taking into account the translation value set by the transition effect.
Preserved the right behavior by using child.getLeft() to compute the value,
without including the X translation.

Change-Id: I25acf6e4bae1db9a2c12525125a4994e16c40dfe
Fixed small Search Bar bug

Repro:
 - Clear Trebuchet app data
 - Disable setting for Search Bar
 - Enable setting for Search Panel
 - Move shortcut/folder in workspace
 - Enter and exit Search Panel
 - Observe small Search Bar

Change-Id: I3d7cd9d5629f3250de6cb22ca9223b67ef558348
Fix GEL integration for RTL mode.

In RTL mode, the Google Now activity starts to the right,
so to return to Trebuchet, the left edge must be swiped.

Change-Id: Ib8869570307b6186e7e9ea19520ed21418a175fb