preliminary fix for #1340

[chochreiner]

Added a textual description for the functionality "Mark Specific Color" since some Look and Feels (including the OSX one) do not consider the Background and Foreground color (at least for) JMenuItem

the current fix at least provides some kind of indicator of the level instead of a blank field as before

[simonharrer]

Would it make sense to use this for the other menu as well, which can be used from within the right-click menu? Or is this not an issue there?

[chochreiner]

the right-click menu works as intended - nevertheless this PR also adds the Level 0 - Level 5 notion there

[simonharrer]

LGTM

[stefan-kolb]

Can you please quickly rebase this, then I'll merge this in.

[codecov-io]

Current coverage is 27.56%

Merging #1344 into master will decrease coverage by -0.87%

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  Lines         46227      46294    +67   
  Methods           0          0          
  Messages          0          0          
  Branches       7633       7650    +17   
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- Hits          13145      12759   -386   
- Misses        31954      32435   +481   
+ Partials       1128       1100    -28   

1. 5 files (not in diff) in .../net/sf/jabref/event were deleted. more
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[chochreiner]

done

[stefan-kolb]

Merci 😄