TermIt

Feedback from testing with user: Whenever the user runs text analysis from the annotator, the screen become shadowed but does not show any message. Thus user is confused as he does not know if it is working or not. This should be solved the same way as the loading file works in the annotator.

Way to reproduce:
1) go to annotator of a file (e.g. https://kbss.felk.cvut.cz/termit-dev/#/resources/otev%C5%99en%C3%A1-data-a-otev%C5%99en%C3%A9-form%C3%A1ln%C3%AD-normy---port%C3%A1l-otev%C5%99en%C3%BDch-dat-%C4%8Desk%C3%A9-republiky.html/annotate?namespace=http://onto.fel.cvut.cz/ontologies/zdroj/)
2) start text analysis
3) [MISSING FEATURE] no processing indicator is showing

I described it in the attachments.