CMFileManager: Add summary to 'case-sensitive sorting'

This commit adds a summary text to the 'Use case-sensevite sorting'
checkbox. This makes it much more easy to find a proper translation
in other languages.

Before: http://goo.gl/zkjsV
After:  http://goo.gl/ntL4U

Change-Id: Ie1ea434142049ef89f6d4f98ad15f42f4fbba222
Merge "CMFileManager: Add summary to 'case-sensitive sorting'" into cm-10.1
CMFileManager: Update italian translation

Change-Id: Iafd23fdf04498fe6fe765feb4e7f165619e38fe8
Merge "CMFileManager: Update italian translation" into cm-10.1
Merge branch 'cm-10.1' of git://github.com/CyanogenMod/android_packages_apps_CMFileManager into cm-10.1