Contrast of several UI elements is too low

[MartinKarim]

Description of Issue	Possible Solution	Additional Remarks
Contrast between entry counters in sidebar and background is too low; Sidebar & toolbar not visually separated; Contrast between alternative rows in entry table not high enough;	Darker background color of sidebar; Darken color of entry counters to contrast of 3:1; Darker alternative row background	Contrast of font should still be high enough;

[samiyac]

Hi, I'm interested in working on this issue.

[tobiasdiez]

Thanks to @samiyac this is now implemented in the latest development version. Could you please check the build from http://builds.jabref.org/master/. Thanks! Please remember to make a backup of your library before trying-out this version.