Prepare test for the specific case of label values in ontology

[grigobog]

Prepare test (as much isolated, as possible), which verifies if ontology with colon in label is saved correctly:

• save element with colon in label to .ttl file
• check if output contains valid label value

Example of the wrong outputs:

:_cbbzacs-eeuieoma0y64yw a owl:NamedIndividual, bbo:UserTask; rdfs:label <Uvedení:%20N/R%20-%20not%20reviewed> .

:_dtq28cs-eeuieoma0y64yw a owl:NamedIndividual, bbo:UserTask; rdfs:label <Uvedení:%20N/A%20-%20not%20applicable> .

Output elements contanis invalid value in rdfs:label, since they are enclosed in "<", ">" instead of quotes.

[grigobog]

This issue is related to https://github.com/kbss-cvut/bpmn2stamp/issues/57

[grigobog]

The test was prepared in the corresponding branch, I tried to make it as isolated as possible. The test reproduces the described bug and verifies if the behavior is correct.