SlimLauncher: initial DE-Translation

Change-Id: I5493882ed41231ab7cb47bb60dab0c96d3300ea8
SlimLauncher: mark arrows as non translatable

Change-Id: Ibb0bbecdbecbfd764c5ac1c76190dfb9d14327e9
SlimLauncher: Move gesture target names array to strings

Change-Id: I1b3ca95094df94967eac6bb8304067414871a2c7