:card_file_box: changed field label of instance fields

[bart-maykin]

Fixes issue in https://github.com/open-formulieren/open-forms/issues/3393

• changed model instance field labels
• changed model instance field label translations

[codecov[bot]]

Codecov Report

Merging #42 (ef6a282) into master (e9adeba) will increase coverage by 0.00%. The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master      #42   +/-   ##
=======================================
  Coverage   96.20%   96.20%           
=======================================
  Files          65       66    +1     
  Lines        3027     3032    +5     
=======================================
+ Hits         2912     2917    +5     
  Misses        115      115           

Files Changed	Coverage Δ
digid_eherkenning/models/eherkenning.py	97.22% <ø> (ø)
...configuration_eh_service_instance_uuid_and_more.py	100.00% <100.00%> (ø)

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