Android: fix UI text capitalization and punctuation

Fix typos and style issues.

Change-Id: I8d1bbccd55e7558e7f8a8bedbab95f4bb8a8478f
Reviewed-by: Daniel Teske <daniel.teske@digia.com>
Project explorer: fix UI text capitalization and punctuation

Fix "Qt Creator" product name. Fix minor language issues.

Change-Id: I403e10e7de60b7cf3433efa2cce5647383995da7
Reviewed-by: Daniel Teske <daniel.teske@digia.com>