Entry Editor: change Optional Fields tab

[MartinKarim]

Description of Issue	Possible Solution	Warnings
Optional information is split between tabs (e.g. deprecated fields,optional fields 2)	unify all information that is not mandatory in the optional fields	if the number of fields gets large, make the liest of fields scrollable or reduce text field size
text fields are too big (height and width) to give a good overview of information	reduce size of text fields	-
dropdown fields look too similar to text fields (month)	make dropdown fields more unique	-
ISBN has a special role;	ISBN and other identifiers are migrated to Web Resources	see #4689
-	-	other changes are found in #4686

[LinusDietz]

Check out BibLaTeX Manual: ftp://ftp.tu-chemnitz.de/pub/tex/macros/latex/contrib/biblatex/doc/biblatex.pdf

[Siedlerchr]

DevCall Decision: Good idea, but be aware between the differences of biblatex and bibtex, e.g. different format numbers.
Also add a tooltip what the field represents (e.g. what is number/series or where to find it)

[ddunig2]

Is this issue taken? If not may I tackle it?