biodiversitylibrary is not parsed well - reject volumes with parethesis

[GlazerMann]

volume=ser.6:t.4 (1884)

where 1884 is the year

[codecov]

Codecov Report

Merging #973 into master will decrease coverage by 0.05%.
The diff coverage is 100%.

@@             Coverage Diff              @@
##             master     #973      +/-   ##
============================================
- Coverage     78.39%   78.34%   -0.06%     
  Complexity     1614     1614              
============================================
  Files            10       10              
  Lines          3388     3389       +1     
============================================
- Hits           2656     2655       -1     
- Misses          732      734       +2

Impacted Files	Coverage Δ	Complexity Δ
api_handlers/zotero.php	81.13% <100%> (+0.11%)	0 <0> (ø)	⬇️
Template.php	77.67% <0%> (-0.1%)	1510% <0%> (ø)

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