CMUpdater: LT translations

Port CM 10.2 strings to CM 11.0

Change-Id: I2ffa5551eca6f3f3d2e3df083253001568f4aba8
CMUpdater: ES translations

 - Refactor plurals
 - Added missing string

Change-Id: I657a19ed5c29a82d7e8952a943554abec7c5fa73
Allow override of update server uri

This allows us to do some testing against development versions of the
API, without flashing a new build.

Change-Id: Ia540dc558ffc9fe2c7c3f541125c7894b567afdd
Handle empty URI properties

Apparently SystemProperties.get returns an empty string instead of null.
We should also protect against users accidentally setting this to "".

Change-Id: I16192e8bb67b9671b18653e0ae818263fa23e46a
Merge remote-tracking branch 'cm/cm-11.0'; commit 'HEAD' into HEAD