Add translation_description to prepare for translation.

Clean up menu items.
- change "Record track" to "Record Track"
- change "Stop recording" to "Stop Recording"
- remove "Delete all tracks", "Please select the track to view",
  "Current track", and "Last segment".
- move "Elevation" to the stat label section.

SignalStrengthSamplerTest/default.properties

@@ -0,0 +1,11 @@
+# This file is automatically generated by Android Tools.
+# Do not modify this file -- YOUR CHANGES WILL BE ERASED!
+#
+# This file must be checked in Version Control Systems.
+#
+# To customize properties used by the Ant build system use,
+# "build.properties", and override values to adapt the script to your
+# project structure.
+
+# Project target.
+target=android-10