[FIXED JENKINS-16630] Human readable file size method returns ",00" for
files with byte length 0
Unit test for JENKINS-16630
Fixed wrong camel casing and simplified dealing with locale
Merge pull request #691 from fredg02/JENKINS-16630

[FIXED JENKINS-16630] Human readable file size method returns ",00" for files with byte length 0
Changelog for [JENKINS-16630]