i18n: a selected value of a property in Properties bar does not depend on language

Description of problem:
This issue affects a properties which has a defined set of values like Task type, Time unit, Distribution type, etc.

A drop down menu contains translated options but the selected value is always displayed in English.

Version-Release number of selected component (if applicable):
6.0.2 ER2 BPMS

Steps to Reproduce:
1. use localization for de, ja, es, ru

• start $LC_ALL=es_ES.UTF-8 ./standalone.sh or
• go to http://localhost:8080/business-central/org.kie.workbench.KIEWebapp/KIEWebapp.html?locale=es_ES
  2. activate a property in Properties Bar (for example Task type, Distribution type, Time unit, etc.)
  3. show all options for this property
  4. select one
  5. deactivate the property

Actual results:
Step 4: You select an option which label is translated (for example "minuto")
After step 5: the property contains a "minute" value.

Expected results:
Both labels should be equal. The label of the selected option should be equal to the label of the value of the property.

Additional info: